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<!--produced on 2014-05-08 @ 7:26 AM-->
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    <link:loc xlink:label="loc_RoyaltyRatePayableOnGrantsReceived.36925.11.7" xlink:href="psti-20140331.xsd#psti_RoyaltyRatePayableOnGrantsReceived" xlink:type="locator" />
    <link:labelArc xlink:from="loc_RoyaltyRatePayableOnGrantsReceived.36925.11.7" xlink:to="lab_RoyaltyRatePayableOnGrantsReceived.325371" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_RoyaltyRatePayableOnGrantsReceived.36925.11.12" xlink:href="psti-20140331.xsd#psti_RoyaltyRatePayableOnGrantsReceived" xlink:type="locator" />
    <link:labelArc xlink:from="loc_RoyaltyRatePayableOnGrantsReceived.36925.11.12" xlink:to="lab_RoyaltyRatePayableOnGrantsReceived.325370" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_RoyaltyRatePayableOnGrantsReceived.325370" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_RoyaltyRatePayableOnGrantsReceived.325370">Maximum royalty payable based on a percentage of grants received.</link:label>
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    <link:loc xlink:label="loc_DocumentFiscalYearFocus.205.11.6" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:type="locator" />
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    <link:loc xlink:label="loc_DocumentType.210.11.7" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" xlink:type="locator" />
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    <link:loc xlink:label="loc_DocumentType.210.11.6" xlink:href="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd#dei_DocumentType" xlink:type="locator" />
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    <link:label xlink:label="lab_DocumentType.32.253638.250528" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_DocumentType.32.253638.250528">Document Type</link:label>
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    <link:label xlink:label="lab_EntityCommonStockSharesOutstanding.105.253642.250531" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EntityCommonStockSharesOutstanding.105.253642.250531">Entity Common Stock, Shares Outstanding</link:label>
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    <link:loc xlink:label="loc_FairValueDisclosuresAbstract.2053.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_RevenueFromGrants.16837" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_RevenueFromGrants.16837">Revenue from Grants</link:label>
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    <link:labelArc xlink:from="loc_RevenueFromGrants.16086.11.7" xlink:to="lab_RevenueFromGrants7.413793.358875" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_RevenueFromGrants7.413793.358875" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_RevenueFromGrants7.413793.358875">Nonrefundable payments received</link:label>
    <link:loc xlink:label="loc_StockIssuedDuringPeriodValuePurchaseOfAssets.17284.11.8" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodValuePurchaseOfAssets" xlink:type="locator" />
    <link:labelArc xlink:from="loc_StockIssuedDuringPeriodValuePurchaseOfAssets.17284.11.8" xlink:to="lab_StockIssuedDuringPeriodValuePurchaseOfAssets.331887.496463.358870" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_StockIssuedDuringPeriodValuePurchaseOfAssets.331887.496463.358870" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US" id="lab_StockIssuedDuringPeriodValuePurchaseOfAssets.331887.496463.358870">Value of common stock issued under CHA agreement</link:label>
    <link:loc xlink:label="loc_ResearchAndDevelopmentMilestoneRevenueReceivable.40988.11.7" xlink:href="psti-20140331.xsd#psti_ResearchAndDevelopmentMilestoneRevenueReceivable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ResearchAndDevelopmentMilestoneRevenueReceivable.40988.11.7" xlink:to="ResearchAndDevelopmentMilestoneRevenueReceivable.358878" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="ResearchAndDevelopmentMilestoneRevenueReceivable.358878" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="ResearchAndDevelopmentMilestoneRevenueReceivable.358878">Milestone revenue receivable</link:label>
    <link:loc xlink:label="loc_ResearchAndDevelopmentMilestoneRevenueReceivable.40988.11.12" xlink:href="psti-20140331.xsd#psti_ResearchAndDevelopmentMilestoneRevenueReceivable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ResearchAndDevelopmentMilestoneRevenueReceivable.40988.11.12" xlink:to="ResearchAndDevelopmentMilestoneRevenueReceivable.358877" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="ResearchAndDevelopmentMilestoneRevenueReceivable.358877" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="ResearchAndDevelopmentMilestoneRevenueReceivable.358877">Maximum revenue receivable as milestone payments for licensing agreements.</link:label>
    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesPurchaseOfAssets.17272.11.8" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets" xlink:type="locator" />
    <link:labelArc xlink:from="loc_StockIssuedDuringPeriodSharesPurchaseOfAssets.17272.11.8" xlink:to="StockIssuedDuringPeriodSharesPurchaseOfAssets.331567.496467.358869" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="StockIssuedDuringPeriodSharesPurchaseOfAssets.331567.496467.358869" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US" id="StockIssuedDuringPeriodSharesPurchaseOfAssets.331567.496467.358869">Issuance of common stock under CHA agreement</link:label>
    <link:loc xlink:label="loc_AccountsPayableCurrent.5684.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccountsPayableCurrent.5684.11.6" xlink:to="lab_AccountsPayableCurrent.12484.253648.250261" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccountsPayableCurrent.12484.253648.250261" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AccountsPayableCurrent.12484.253648.250261">Accounts Payable, Current</link:label>
    <link:loc xlink:label="loc_AccountsPayableCurrent.5684.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccountsPayableCurrent.5684.11.7" xlink:to="lab_AccountsPayableCurrent7.286696.253649.250262" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccountsPayableCurrent7.286696.253649.250262" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AccountsPayableCurrent7.286696.253649.250262">Trade payables</link:label>
    <link:loc xlink:label="loc_AccountsPayableOtherCurrent.5690.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableOtherCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccountsPayableOtherCurrent.5690.11.6" xlink:to="lab_AccountsPayableOtherCurrent.15954.253650.250263" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccountsPayableOtherCurrent.15954.253650.250263" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AccountsPayableOtherCurrent.15954.253650.250263">Accounts Payable, Other, Current</link:label>
    <link:loc xlink:label="loc_AccountsPayableOtherCurrent.5690.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccountsPayableOtherCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccountsPayableOtherCurrent.5690.11.7" xlink:to="lab_AccountsPayableOtherCurrent.286699.253651.250264" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccountsPayableOtherCurrent.286699.253651.250264" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AccountsPayableOtherCurrent.286699.253651.250264">Other accounts payable</link:label>
    <link:loc xlink:label="loc_AccruedLiabilitiesCurrent.5762.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccruedLiabilitiesCurrent.5762.11.6" xlink:to="lab_AccruedLiabilitiesCurrent.12488.253652.250265" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccruedLiabilitiesCurrent.12488.253652.250265" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AccruedLiabilitiesCurrent.12488.253652.250265">Accrued Liabilities, Current</link:label>
    <link:loc xlink:label="loc_AccruedLiabilitiesCurrent.5762.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccruedLiabilitiesCurrent.5762.11.7" xlink:to="lab_AccruedLiabilitiesCurrent7.286698.253653.250266" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccruedLiabilitiesCurrent7.286698.253653.250266" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AccruedLiabilitiesCurrent7.286698.253653.250266">Accrued expenses</link:label>
    <link:loc xlink:label="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax.5786.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax.5786.11.6" xlink:to="lab_AccumulatedOtherComprehensiveIncomeLossNetOfTax.345.253654.250267" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccumulatedOtherComprehensiveIncomeLossNetOfTax.345.253654.250267" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AccumulatedOtherComprehensiveIncomeLossNetOfTax.345.253654.250267">Accumulated Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:loc xlink:label="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax.5786.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax.5786.11.7" xlink:to="lab_AccumulatedOtherComprehensiveIncomeLossNetOfTax7.333710.253655.250268" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AccumulatedOtherComprehensiveIncomeLossNetOfTax7.333710.253655.250268" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AccumulatedOtherComprehensiveIncomeLossNetOfTax7.333710.253655.250268">Other comprehensive income</link:label>
    <link:loc xlink:label="loc_AdditionalPaidInCapital.5816.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AdditionalPaidInCapital.5816.11.6" xlink:to="lab_AdditionalPaidInCapital.400.253656.250269" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AdditionalPaidInCapital.400.253656.250269" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AdditionalPaidInCapital.400.253656.250269">Additional Paid in Capital</link:label>
    <link:loc xlink:label="loc_AdditionalPaidInCapital.5816.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AdditionalPaidInCapital.5816.11.7" xlink:to="lab_AdditionalPaidInCapital7.286706.253657.250270" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AdditionalPaidInCapital7.286706.253657.250270" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AdditionalPaidInCapital7.286706.253657.250270">Additional paid-in capital</link:label>
    <link:loc xlink:label="loc_Assets.6057.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:type="locator" />
    <link:labelArc xlink:from="loc_Assets.6057.11.9" xlink:to="lab_Assets.286693.253659.250271" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_Assets.286693.253659.250271" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_Assets.286693.253659.250271">Total assets</link:label>
    <link:loc xlink:label="loc_Assets.6057.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Assets" xlink:type="locator" />
    <link:labelArc xlink:from="loc_Assets.6057.11.6" xlink:to="lab_Assets.8758.253658.250272" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_Assets.8758.253658.250272" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_Assets.8758.253658.250272">Assets</link:label>
    <link:loc xlink:label="loc_AssetsAbstract.620.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsAbstract.620.11.7" xlink:to="lab_AssetsAbstract.286679.253661.250273" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsAbstract.286679.253661.250273" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AssetsAbstract.286679.253661.250273">ASSETS</link:label>
    <link:loc xlink:label="loc_AssetsAbstract.620.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsAbstract.620.11.6" xlink:to="lab_AssetsAbstract.9477.253660.250274" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsAbstract.9477.253660.250274" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AssetsAbstract.9477.253660.250274">Assets [Abstract]</link:label>
    <link:loc xlink:label="loc_AssetsCurrent.6084.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsCurrent.6084.11.9" xlink:to="lab_AssetsCurrent.286686.253663.250275" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsCurrent.286686.253663.250275" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_AssetsCurrent.286686.253663.250275">Total current assets</link:label>
    <link:loc xlink:label="loc_AssetsCurrent.6084.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsCurrent.6084.11.6" xlink:to="lab_AssetsCurrent.8038.253662.250276" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsCurrent.8038.253662.250276" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AssetsCurrent.8038.253662.250276">Assets, Current</link:label>
    <link:loc xlink:label="loc_AssetsCurrentAbstract.616.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsCurrentAbstract.616.11.7" xlink:to="lab_AssetsCurrentAbstract.286680.253665.250277" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsCurrentAbstract.286680.253665.250277" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AssetsCurrentAbstract.286680.253665.250277">CURRENT ASSETS:</link:label>
    <link:loc xlink:label="loc_AssetsCurrentAbstract.616.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsCurrentAbstract.616.11.6" xlink:to="lab_AssetsCurrentAbstract.8037.253664.250278" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsCurrentAbstract.8037.253664.250278" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AssetsCurrentAbstract.8037.253664.250278">Assets, Current [Abstract]</link:label>
    <link:loc xlink:label="loc_AssetsNoncurrent.6080.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsNoncurrent.6080.11.9" xlink:to="lab_AssetsNoncurrent.286692.253667.250279" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsNoncurrent.286692.253667.250279" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_AssetsNoncurrent.286692.253667.250279">Total long-term assets</link:label>
    <link:loc xlink:label="loc_AssetsNoncurrent.6080.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsNoncurrent.6080.11.6" xlink:to="lab_AssetsNoncurrent.5105.253666.250280" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsNoncurrent.5105.253666.250280" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AssetsNoncurrent.5105.253666.250280">Assets, Noncurrent</link:label>
    <link:loc xlink:label="loc_AssetsNoncurrentAbstract.634.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsNoncurrentAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AssetsNoncurrentAbstract.634.11.7" xlink:to="lab_AssetsNoncurrentAbstract.286688.253669.250281" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AssetsNoncurrentAbstract.286688.253669.250281" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AssetsNoncurrentAbstract.286688.253669.250281">LONG-TERM ASSETS:</link:label>
    <link:loc xlink:label="loc_AssetsNoncurrentAbstract.634.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AssetsNoncurrentAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_AssetsNoncurrentAbstract.5104.253668.250282" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AssetsNoncurrentAbstract.5104.253668.250282">Assets, Noncurrent [Abstract]</link:label>
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    <link:label xlink:label="lab_CommonStockValue.1498.253674.250287" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CommonStockValue.1498.253674.250287">Common Stock, Value, Issued</link:label>
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    <link:label xlink:label="lab_CommonStockValue7.286705.253675.250288" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_CommonStockValue7.286705.253675.250288">Common stock $0.00001 par value: Authorized: 100,000,000 shares Issued and outstanding: 67,849,535 shares as of March 31, 2014, 59,196,617 shares as of June 30, 2013</link:label>
    <link:loc xlink:label="loc_CustomerAdvancesCurrent.7552.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CustomerAdvancesCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_CustomerAdvancesCurrent.7552.11.6" xlink:to="lab_CustomerAdvancesCurrent.1834.253676.250289" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_CustomerAdvancesCurrent.1834.253676.250289" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CustomerAdvancesCurrent.1834.253676.250289">Customer Advances, Current</link:label>
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    <link:labelArc xlink:from="loc_CustomerAdvancesCurrent.7552.11.7" xlink:to="lab_CustomerAdvancesCurrent.333706.253677.250290" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_CustomerAdvancesCurrent.333706.253677.250290" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_CustomerAdvancesCurrent.333706.253677.250290">Advance payment from United Therapeutics</link:label>
    <link:loc xlink:label="loc_DeferredRevenueCurrent.7937.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_DeferredRevenueCurrent.7937.11.6" xlink:to="lab_DeferredRevenueCurrent.2193.253678.250291" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_DeferredRevenueCurrent.2193.253678.250291" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_DeferredRevenueCurrent.2193.253678.250291">Deferred Revenue, Current</link:label>
    <link:loc xlink:label="loc_DeferredRevenueCurrent.7937.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_DeferredRevenueCurrent.7937.11.7" xlink:to="lab_DeferredRevenueCurrent7.333704.253679.250292" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_DeferredRevenueCurrent7.333704.253679.250292" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_DeferredRevenueCurrent7.333704.253679.250292">Deferred revenues</link:label>
    <link:loc xlink:label="loc_DeferredRevenueNoncurrent.7950.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_DeferredRevenueNoncurrent.7950.11.6" xlink:to="lab_DeferredRevenueNoncurrent.2195.253680.250293" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_DeferredRevenueNoncurrent.2195.253680.250293" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_DeferredRevenueNoncurrent.2195.253680.250293">Deferred Revenue, Noncurrent</link:label>
    <link:loc xlink:label="loc_DeferredRevenueNoncurrent.7950.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_DeferredRevenueNoncurrent.7950.11.7" xlink:to="lab_DeferredRevenueNoncurrent.333707.253681.250294" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_DeferredRevenueNoncurrent.333707.253681.250294" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_DeferredRevenueNoncurrent.333707.253681.250294">Deferred revenues</link:label>
    <link:loc xlink:label="loc_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent.8274.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent.8274.11.6" xlink:to="lab_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent.16045.253682.250295" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent.8274.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:type="locator" />
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    <link:loc xlink:label="loc_EquityAbstract.1857.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_EquityAbstract.286704.253687.250299" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_EquityAbstract.286704.253687.250299">STOCKHOLDERS' EQUITY</link:label>
    <link:loc xlink:label="loc_EquityAbstract.1857.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_EquityAbstract.9804.253686.250300" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EquityAbstract.9804.253686.250300">Equity [Abstract]</link:label>
    <link:loc xlink:label="loc_LiabilitiesAndStockholdersEquity.12135.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:type="locator" />
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    <link:loc xlink:label="loc_LiabilitiesAndStockholdersEquity.12135.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:type="locator" />
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    <link:loc xlink:label="loc_LiabilitiesAndStockholdersEquityAbstract.3066.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_LiabilitiesAndStockholdersEquityAbstract.286697.253691.250303" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_LiabilitiesAndStockholdersEquityAbstract.286697.253691.250303">LIABILITIES AND STOCKHOLDERS' EQUITY</link:label>
    <link:loc xlink:label="loc_LiabilitiesAndStockholdersEquityAbstract.3066.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:type="locator" />
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    <link:loc xlink:label="loc_LiabilitiesCurrent.12126.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:type="locator" />
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    <link:loc xlink:label="loc_LiabilitiesCurrentAbstract.3060.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:type="locator" />
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    <link:loc xlink:label="loc_LiabilitiesCurrentAbstract.3060.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:type="locator" />
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    <link:loc xlink:label="loc_LiabilitiesNoncurrent.12165.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:type="locator" />
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    <link:labelArc xlink:from="loc_LongTermInvestments.12743.11.7" xlink:to="lab_LongTermInvestments.134115.358787" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_LongTermInvestments.134115.358787" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_LongTermInvestments.134115.358787">Long-term deposits and restricted deposits</link:label>
    <link:loc xlink:label="loc_MarketableSecuritiesCurrent.12977.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_MarketableSecuritiesCurrent.12977.11.7" xlink:to="lab_MarketableSecuritiesCurrent.333699.253701.250548" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_MarketableSecuritiesCurrent.333699.253701.250548" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_MarketableSecuritiesCurrent.333699.253701.250548">Marketable securities</link:label>
    <link:loc xlink:label="loc_MarketableSecuritiesCurrent.12977.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_MarketableSecuritiesCurrent.12977.11.6" xlink:to="lab_MarketableSecuritiesCurrent.4731.253700.250549" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_MarketableSecuritiesCurrent.4731.253700.250549" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_MarketableSecuritiesCurrent.4731.253700.250549">Marketable Securities, Current</link:label>
    <link:loc xlink:label="loc_OtherAssetsCurrent.13853.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherAssetsCurrent.13853.11.6" xlink:to="lab_OtherAssetsCurrent.13299" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherAssetsCurrent.13299" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_OtherAssetsCurrent.13299">Other Assets, Current</link:label>
    <link:loc xlink:label="loc_OtherAssetsCurrent.13853.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherAssetsCurrent.13853.11.7" xlink:to="lab_OtherAssetsCurrent.223285.183150" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherAssetsCurrent.223285.183150" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_OtherAssetsCurrent.223285.183150">Other current assets</link:label>
    <link:loc xlink:label="loc_OtherAssetsNoncurrent.13824.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherAssetsNoncurrent.13824.11.6" xlink:to="lab_OtherAssetsNoncurrent.10355.253704.250313" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherAssetsNoncurrent.10355.253704.250313" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_OtherAssetsNoncurrent.10355.253704.250313">Other Assets, Noncurrent</link:label>
    <link:loc xlink:label="loc_OtherAssetsNoncurrent.13824.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherAssetsNoncurrent.13824.11.7" xlink:to="lab_OtherAssetsNoncurrent7.1840923.253705.250314" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherAssetsNoncurrent7.1840923.253705.250314" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_OtherAssetsNoncurrent7.1840923.253705.250314">Other long term assets</link:label>
    <link:loc xlink:label="loc_OtherLiabilitiesNoncurrent.14010.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherLiabilitiesNoncurrent.14010.11.6" xlink:to="lab_OtherLiabilitiesNoncurrent.12946.250315" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherLiabilitiesNoncurrent.12946.250315" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_OtherLiabilitiesNoncurrent.12946.250315">Other Liabilities, Noncurrent</link:label>
    <link:loc xlink:label="loc_OtherLiabilitiesNoncurrent.14010.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherLiabilitiesNoncurrent.14010.11.7" xlink:to="lab_OtherLiabilitiesNoncurrent.489053.250316" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherLiabilitiesNoncurrent.489053.250316" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_OtherLiabilitiesNoncurrent.489053.250316">Other long-term liabilities</link:label>
    <link:loc xlink:label="loc_PostemploymentBenefitsLiabilityNoncurrent.14601.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PostemploymentBenefitsLiabilityNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PostemploymentBenefitsLiabilityNoncurrent.14601.11.7" xlink:to="lab_PostemploymentBenefitsLiabilityNoncurrent.1872220.190675" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PostemploymentBenefitsLiabilityNoncurrent.1872220.190675" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_PostemploymentBenefitsLiabilityNoncurrent.1872220.190675">Accrued severance pay</link:label>
    <link:loc xlink:label="loc_PostemploymentBenefitsLiabilityNoncurrent.14601.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PostemploymentBenefitsLiabilityNoncurrent" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PostemploymentBenefitsLiabilityNoncurrent.14601.11.6" xlink:to="lab_PostemploymentBenefitsLiabilityNoncurrent.2021.253709.250320" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PostemploymentBenefitsLiabilityNoncurrent.2021.253709.250320" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_PostemploymentBenefitsLiabilityNoncurrent.2021.253709.250320">Postemployment Benefits Liability, Noncurrent</link:label>
    <link:loc xlink:label="loc_PropertyPlantAndEquipmentNet.15211.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PropertyPlantAndEquipmentNet.15211.11.7" xlink:to="lab_PropertyPlantAndEquipmentNet.286691.253714.250322" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PropertyPlantAndEquipmentNet.286691.253714.250322" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_PropertyPlantAndEquipmentNet.286691.253714.250322">Property and equipment, net</link:label>
    <link:loc xlink:label="loc_PropertyPlantAndEquipmentNet.15211.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PropertyPlantAndEquipmentNet.15211.11.6" xlink:to="lab_PropertyPlantAndEquipmentNet.6369.253713.250323" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PropertyPlantAndEquipmentNet.6369.253713.250323" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_PropertyPlantAndEquipmentNet.6369.253713.250323">Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:label="loc_RestrictedCashAndCashEquivalentsAtCarryingValue.15928.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_RestrictedCashAndCashEquivalentsAtCarryingValue.15928.11.6" xlink:to="lab_RestrictedCashAndCashEquivalentsAtCarryingValue.16592" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_RestrictedCashAndCashEquivalentsAtCarryingValue.16592" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_RestrictedCashAndCashEquivalentsAtCarryingValue.16592">Restricted Cash and Cash Equivalents, Current</link:label>
    <link:loc xlink:label="loc_RestrictedCashAndCashEquivalentsAtCarryingValue.15928.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_RestrictedCashAndCashEquivalentsAtCarryingValue.15928.11.7" xlink:to="lab_RestrictedCashAndCashEquivalentsAtCarryingValue.512318.250974" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_RestrictedCashAndCashEquivalentsAtCarryingValue.512318.250974" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_RestrictedCashAndCashEquivalentsAtCarryingValue.512318.250974">Restricted cash and restricted short-term deposits</link:label>
    <link:loc xlink:label="loc_RetainedEarningsAccumulatedDeficit.16058.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:type="locator" />
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    <link:label xlink:label="lab_RetainedEarningsAccumulatedDeficit.7073.253717.250555" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_RetainedEarningsAccumulatedDeficit.7073.253717.250555">Retained Earnings (Accumulated Deficit)</link:label>
    <link:loc xlink:label="loc_RetainedEarningsAccumulatedDeficit.16058.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:type="locator" />
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    <link:label xlink:label="lab_RetainedEarningsAccumulatedDeficit7.288027.253718.250556" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_RetainedEarningsAccumulatedDeficit7.288027.253718.250556">Accumulated deficit</link:label>
    <link:loc xlink:label="loc_ShortTermInvestments.17066.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermInvestments" xlink:type="locator" />
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    <link:label xlink:label="lab_ShortTermInvestments.334612.253720.250326" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ShortTermInvestments.334612.253720.250326">Short-term bank deposits</link:label>
    <link:loc xlink:label="loc_ShortTermInvestments.17066.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShortTermInvestments" xlink:type="locator" />
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    <link:label xlink:label="lab_ShortTermInvestments.7720.253719.250327" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ShortTermInvestments.7720.253719.250327">Short-term Investments</link:label>
    <link:loc xlink:label="loc_StatementOfFinancialPositionAbstract.5171.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_StatementOfFinancialPositionAbstract.286678.253721.250328" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_StatementOfFinancialPositionAbstract.286678.253721.250328">CONSOLIDATED BALANCE SHEETS [Abstract]</link:label>
    <link:loc xlink:label="loc_StockholdersEquity.17302.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:type="locator" />
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    <link:label xlink:label="lab_StockholdersEquity.286708.253723.250329" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_StockholdersEquity.286708.253723.250329">Total stockholders' equity</link:label>
    <link:loc xlink:label="loc_StockholdersEquity.17302.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockholdersEquity" xlink:type="locator" />
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    <link:label xlink:label="lab_StockholdersEquity.287265.253722.250330" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_StockholdersEquity.287265.253722.250330">Stockholders Equity</link:label>
    <link:loc xlink:label="loc_CommonStockParOrStatedValuePerShare.7131.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:type="locator" />
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    <link:loc xlink:label="loc_CommonStockParOrStatedValuePerShare.7131.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:type="locator" />
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    <link:label xlink:label="lab_CommonStockParOrStatedValuePerShare.286710.253725.250332" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_CommonStockParOrStatedValuePerShare.286710.253725.250332">Common stock, par value per share</link:label>
    <link:loc xlink:label="loc_CommonStockSharesAuthorized.7144.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:type="locator" />
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    <link:label xlink:label="lab_CommonStockSharesAuthorized.1491.253726.250333" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CommonStockSharesAuthorized.1491.253726.250333">Common Stock, Shares Authorized</link:label>
    <link:loc xlink:label="loc_CommonStockSharesAuthorized.7144.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:type="locator" />
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    <link:label xlink:label="lab_CommonStockSharesIssued.10338.253728.250335" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CommonStockSharesIssued.10338.253728.250335">Common Stock, Shares, Issued</link:label>
    <link:loc xlink:label="loc_CommonStockSharesIssued.7136.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:type="locator" />
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    <link:loc xlink:label="loc_CommonStockSharesOutstanding.7164.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:type="locator" />
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    <link:loc xlink:label="loc_CommonStockSharesOutstanding.7164.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:type="locator" />
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    <link:loc xlink:label="loc_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities.28696.11.7" xlink:href="psti-20140331.xsd#psti_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities" xlink:type="locator" />
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    <link:loc xlink:label="loc_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities.28696.11.6" xlink:href="psti-20140331.xsd#psti_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities.28696.11.6" xlink:to="lab_AmortizationOfDiscountAndPremiumAndChangesInAccruedInterestFromMarketableSecurities.333245.253768.250350" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:labelArc xlink:from="loc_CapitalExpendituresIncurredButNotYetPaid.6683.11.6" xlink:to="lab_CapitalExpendituresIncurredButNotYetPaid.2057" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_CapitalExpendituresIncurredButNotYetPaid.2057" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CapitalExpendituresIncurredButNotYetPaid.2057">Capital Expenditures Incurred but Not yet Paid</link:label>
    <link:loc xlink:label="loc_CapitalExpendituresIncurredButNotYetPaid.6683.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:type="locator" />
    <link:labelArc xlink:from="loc_CapitalExpendituresIncurredButNotYetPaid.6683.11.7" xlink:to="lab_CapitalExpendituresIncurredButNotYetPaid.134513.358864" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_CashAndCashEquivalentsAtCarryingValue.6843.11.10" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_CashAndCashEquivalentsAtCarryingValue.6843.11.10" xlink:to="lab_CashAndCashEquivalentsAtCarryingValue.286815.253771.250351" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_CashAndCashEquivalentsAtCarryingValue.6843.11.11" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_CashAndCashEquivalentsAtCarryingValue.6843.11.11" xlink:to="lab_CashAndCashEquivalentsAtCarryingValue.286816.253772.250352" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_CashAndCashEquivalentsPeriodIncreaseDecrease.6834.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:type="locator" />
    <link:labelArc xlink:from="loc_CashAndCashEquivalentsPeriodIncreaseDecrease.6834.11.9" xlink:to="lab_CashAndCashEquivalentsPeriodIncreaseDecrease.286814.253774.250353" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_CashAndCashEquivalentsPeriodIncreaseDecrease.6834.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:type="locator" />
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    <link:loc xlink:label="loc_Depreciation.8347.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" xlink:type="locator" />
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    <link:label xlink:label="lab_Depreciation.286738.253786.250361" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_Depreciation.286738.253786.250361">Depreciation</link:label>
    <link:loc xlink:label="loc_Depreciation.8347.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Depreciation" xlink:type="locator" />
    <link:labelArc xlink:from="loc_Depreciation.8347.11.6" xlink:to="lab_Depreciation.437.253785.250362" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_Depreciation.437.253785.250362" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_Depreciation.437.253785.250362">Depreciation</link:label>
    <link:loc xlink:label="loc_GainLossOnSaleOfPropertyPlantEquipment.10640.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:type="locator" />
    <link:labelArc xlink:from="loc_GainLossOnSaleOfPropertyPlantEquipment.10640.11.52" xlink:to="lab_GainLossOnSaleOfPropertyPlantEquipment.286739.253791.250363" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_GainLossOnSaleOfPropertyPlantEquipment.10640.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:type="locator" />
    <link:labelArc xlink:from="loc_GainLossOnSaleOfPropertyPlantEquipment.10640.11.6" xlink:to="lab_GainLossOnSaleOfPropertyPlantEquipment.3366.253790.250364" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_IncomeTaxesPaid.11165.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:type="locator" />
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    <link:label xlink:label="lab_IncomeTaxesPaid.7963.253794.250366" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncomeTaxesPaid.7963.253794.250366">Income Taxes Paid</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInAccountsPayable.11272.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInAccountsPayable.11272.11.6" xlink:to="lab_IncreaseDecreaseInAccountsPayable.1389.253796.250367" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_IncreaseDecreaseInAccountsPayable.11272.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:type="locator" />
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    <link:label xlink:label="lab_IncreaseDecreaseInAccountsPayable7.286759.253797.250368" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInAccountsPayable7.286759.253797.250368">Increase in trade payables</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInCustomerAdvances.11333.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInCustomerAdvances" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInCustomerAdvances.11333.11.6" xlink:to="lab_IncreaseDecreaseInCustomerAdvances.16453.253802.250371" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInCustomerAdvances.16453.253802.250371" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInCustomerAdvances.16453.253802.250371">Increase (Decrease) in Customer Advances</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInCustomerAdvances.11333.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInCustomerAdvances" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInCustomerAdvances.11333.11.7" xlink:to="lab_IncreaseDecreaseInCustomerAdvances.333740.253803.250372" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_IncreaseDecreaseInDeferredRevenue.11341.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInDeferredRevenue.11341.11.6" xlink:to="lab_IncreaseDecreaseInDeferredRevenue.17095.253804.250373" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInDeferredRevenue.17095.253804.250373" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInDeferredRevenue.17095.253804.250373">Increase (Decrease) in Deferred Revenue</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInDeferredRevenue.11341.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInDeferredRevenue.11341.11.7" xlink:to="lab_IncreaseDecreaseInDeferredRevenue.333739.253805.250374" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInDeferredRevenue.333739.253805.250374" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInDeferredRevenue.333739.253805.250374">Decrease in deferred revenues</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.11371.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.11371.11.6" xlink:to="lab_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.9279" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.9279" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.9279">Increase (Decrease) in Other Accounts Payable and Accrued Liabilities</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.11371.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.11371.11.7" xlink:to="lab_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.1887944.358784" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.1887944.358784" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities.1887944.358784">Increase in other accounts payable and accrued expenses</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInOtherReceivables.11378.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherReceivables" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInOtherReceivables.11378.11.6" xlink:to="lab_IncreaseDecreaseInOtherReceivables.16486.253808.250375" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInOtherReceivables.16486.253808.250375" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInOtherReceivables.16486.253808.250375">Increase (Decrease) in Other Receivables</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInOtherReceivables.11378.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInOtherReceivables" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInOtherReceivables.11378.11.52" xlink:to="lab_IncreaseDecreaseInOtherReceivables.333788.253809.250376" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInOtherReceivables.333788.253809.250376" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInOtherReceivables.333788.253809.250376">Decrease (increase) in other accounts receivable</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInPensionAndPostretirementObligations.11476.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInPensionAndPostretirementObligations.11476.11.6" xlink:to="lab_IncreaseDecreaseInPensionAndPostretirementObligations.11801.253810.250377" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInPensionAndPostretirementObligations.11801.253810.250377" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInPensionAndPostretirementObligations.11801.253810.250377">Increase (Decrease) in Pension and Postretirement Obligations</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInPensionAndPostretirementObligations.11476.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInPensionAndPostretirementObligations.11476.11.7" xlink:to="lab_IncreaseDecreaseInPensionAndPostretirementObligations.286777.253811.250378" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInPensionAndPostretirementObligations.286777.253811.250378" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInPensionAndPostretirementObligations.286777.253811.250378">Accrued severance pay, net</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets.11432.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets.11432.11.6" xlink:to="lab_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets.1379.253812.250379" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets.1379.253812.250379" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets.1379.253812.250379">Increase (Decrease) in Prepaid Expense and Other Assets</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets.11432.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets.11432.11.52" xlink:to="lab_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets7.286758.253813.250380" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets7.286758.253813.250380" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets7.286758.253813.250380">Increase in prepaid expenses</link:label>
    <link:loc xlink:label="loc_IncreaseDecreaseInRestrictedCashAndInvestments.11274.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IncreaseDecreaseInRestrictedCashAndInvestments.11274.11.6" xlink:to="lab_IncreaseDecreaseInRestrictedCashAndInvestments.9148" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IncreaseDecreaseInRestrictedCashAndInvestments.9148" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncreaseDecreaseInRestrictedCashAndInvestments.9148">Increase (Decrease) in Restricted Cash and Investments</link:label>
    <link:loc xlink:label="loc_IssuanceOfStockAndWarrantsForServicesOrClaims.12013.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IssuanceOfStockAndWarrantsForServicesOrClaims.12013.11.7" xlink:to="lab_IssuanceOfStockAndWarrantsForServicesOrClaims.288031.253825.250391" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IssuanceOfStockAndWarrantsForServicesOrClaims.288031.253825.250391" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_IssuanceOfStockAndWarrantsForServicesOrClaims.288031.253825.250391">Stock compensation to investor relations consultants</link:label>
    <link:loc xlink:label="loc_IssuanceOfStockAndWarrantsForServicesOrClaims.12013.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims" xlink:type="locator" />
    <link:labelArc xlink:from="loc_IssuanceOfStockAndWarrantsForServicesOrClaims.12013.11.6" xlink:to="lab_IssuanceOfStockAndWarrantsForServicesOrClaims.448.253824.250392" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_IssuanceOfStockAndWarrantsForServicesOrClaims.448.253824.250392" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IssuanceOfStockAndWarrantsForServicesOrClaims.448.253824.250392">Issuance of Stock and Warrants for Services or Claims</link:label>
    <link:loc xlink:label="loc_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.28733.11.6" xlink:href="psti-20140331.xsd#psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit" xlink:type="locator" />
    <link:labelArc xlink:from="loc_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.28733.11.6" xlink:to="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921824.253832.250393" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921824.253832.250393" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921824.253832.250393">Linkage Differences And Interest On Short And Long Term Restricted Lease Deposit</link:label>
    <link:loc xlink:label="loc_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.28733.11.12" xlink:href="psti-20140331.xsd#psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit" xlink:type="locator" />
    <link:labelArc xlink:from="loc_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.28733.11.12" xlink:to="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921825.253834.250394" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921825.253834.250394" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921825.253834.250394">Linkage differences and interest on short and long term restricted lease deposit.</link:label>
    <link:loc xlink:label="loc_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.28733.11.7" xlink:href="psti-20140331.xsd#psti_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit" xlink:type="locator" />
    <link:labelArc xlink:from="loc_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.28733.11.7" xlink:to="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921826.253833.250395" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921826.253833.250395" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_LinkageDifferencesAndInterestOnShortAndLongTermRestrictedLeaseDeposit.1921826.253833.250395">Linkage differences and Increase (decrease) interest on short and long-term deposit and restricted lease deposit</link:label>
    <link:loc xlink:label="loc_MarketableSecuritiesRealizedGainLoss.12971.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MarketableSecuritiesRealizedGainLoss" xlink:type="locator" />
    <link:labelArc xlink:from="loc_MarketableSecuritiesRealizedGainLoss.12971.11.52" xlink:to="lab_MarketableSecuritiesRealizedGainLoss.286774.253842.250399" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_MarketableSecuritiesRealizedGainLoss.286774.253842.250399" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_MarketableSecuritiesRealizedGainLoss.286774.253842.250399">Loss from sale of available-for-sale marketable securities</link:label>
    <link:loc xlink:label="loc_MarketableSecuritiesRealizedGainLoss.12971.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MarketableSecuritiesRealizedGainLoss" xlink:type="locator" />
    <link:labelArc xlink:from="loc_MarketableSecuritiesRealizedGainLoss.12971.11.6" xlink:to="lab_MarketableSecuritiesRealizedGainLoss.8832.253841.250400" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_MarketableSecuritiesRealizedGainLoss.8832.253841.250400" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_MarketableSecuritiesRealizedGainLoss.8832.253841.250400">Marketable Securities, Realized Gain (Loss)</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract.3499.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract.3499.11.6" xlink:to="lab_NetCashProvidedByUsedInFinancingActivitiesAbstract.16836.253849.250405" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInFinancingActivitiesAbstract.16836.253849.250405" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInFinancingActivitiesAbstract.16836.253849.250405">Net Cash Provided by (Used in) Financing Activities [Abstract]</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract.3499.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract.3499.11.7" xlink:to="lab_NetCashProvidedByUsedInFinancingActivitiesAbstract.286797.253850.250406" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInFinancingActivitiesAbstract.286797.253850.250406" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInFinancingActivitiesAbstract.286797.253850.250406">CASH FLOWS FROM FINANCING ACTIVITIES:</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.13240.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.13240.11.6" xlink:to="lab_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.12278" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.12278" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.12278">Net Cash Provided by (Used in) Financing Activities, Continuing Operations</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.13240.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.13240.11.9" xlink:to="lab_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.310997" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.310997" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations.310997">Net cash provided by financing activities</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract.3520.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract.3520.11.6" xlink:to="lab_NetCashProvidedByUsedInInvestingActivitiesAbstract.16837.253853.250409" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInInvestingActivitiesAbstract.16837.253853.250409" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInInvestingActivitiesAbstract.16837.253853.250409">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract.3520.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract.3520.11.7" xlink:to="lab_NetCashProvidedByUsedInInvestingActivitiesAbstract.286779.253854.250410" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInInvestingActivitiesAbstract.286779.253854.250410" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInInvestingActivitiesAbstract.286779.253854.250410">CASH FLOWS FROM INVESTING ACTIVITIES:</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.13250.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.13250.11.6" xlink:to="lab_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.12298" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.12298" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.12298">Net Cash Provided by (Used in) Investing Activities, Continuing Operations</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.13250.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.13250.11.9" xlink:to="lab_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.310996" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.310996" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations.310996">Net cash used in investing activities</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract.3521.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract.3521.11.6" xlink:to="lab_NetCashProvidedByUsedInOperatingActivitiesAbstract.16838.253857.250413" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInOperatingActivitiesAbstract.16838.253857.250413" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInOperatingActivitiesAbstract.16838.253857.250413">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract.3521.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract.3521.11.7" xlink:to="lab_NetCashProvidedByUsedInOperatingActivitiesAbstract.286735.253858.250414" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInOperatingActivitiesAbstract.286735.253858.250414" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInOperatingActivitiesAbstract.286735.253858.250414">CASH FLOWS FROM OPERATING ACTIVITIES:</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.13221.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.13221.11.6" xlink:to="lab_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.12234" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.12234" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.12234">Net Cash Provided by (Used in) Operating Activities, Continuing Operations</link:label>
    <link:loc xlink:label="loc_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.13221.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.13221.11.9" xlink:to="lab_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.310995" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.310995" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations.310995">Net cash used in operating activities</link:label>
    <link:loc xlink:label="loc_NetIncomeLoss.13265.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:type="locator" />
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    <link:label xlink:label="lab_NetIncomeLoss.287266.253859.250553" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NetIncomeLoss.287266.253859.250553">Net loss for the period</link:label>
    <link:loc xlink:label="loc_NetIncomeLoss.13265.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetIncomeLoss.13265.11.7" xlink:to="lab_NetIncomeLoss7.286736.253860.250554" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetIncomeLoss7.286736.253860.250554" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetIncomeLoss7.286736.253860.250554">Net loss</link:label>
    <link:loc xlink:label="loc_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.13315.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.13315.11.6" xlink:to="lab_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.12414" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.12414" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.12414">Noncash or Part Noncash Acquisition, Investments Acquired</link:label>
    <link:loc xlink:label="loc_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.13315.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.13315.11.7" xlink:to="lab_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.110207.310986.495466.323086" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.110207.310986.495466.323086" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1.110207.310986.495466.323086">Issuance of common stock under CHA Agreement (Note 1c)</link:label>
    <link:loc xlink:label="loc_OtherNoncashInvestingAndFinancingItemsAbstract.3833.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherNoncashInvestingAndFinancingItemsAbstract.3833.11.6" xlink:to="lab_OtherNoncashInvestingAndFinancingItemsAbstract.10120.253861.250415" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherNoncashInvestingAndFinancingItemsAbstract.10120.253861.250415" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_OtherNoncashInvestingAndFinancingItemsAbstract.10120.253861.250415">Other Noncash Investing and Financing Items [Abstract]</link:label>
    <link:loc xlink:label="loc_OtherNoncashInvestingAndFinancingItemsAbstract.3833.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherNoncashInvestingAndFinancingItemsAbstract.3833.11.7" xlink:to="lab_OtherNoncashInvestingAndFinancingItemsAbstract.286820.253862.250416" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherNoncashInvestingAndFinancingItemsAbstract.286820.253862.250416" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_OtherNoncashInvestingAndFinancingItemsAbstract.286820.253862.250416">Supplemental disclosure of non-cash activities:</link:label>
    <link:loc xlink:label="loc_PaymentsForProceedsFromLongtermInvestments.14283.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForProceedsFromLongtermInvestments" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PaymentsForProceedsFromLongtermInvestments.14283.11.6" xlink:to="lab_PaymentsForProceedsFromLongtermInvestments.14015" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PaymentsForProceedsFromLongtermInvestments.14015" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_PaymentsForProceedsFromLongtermInvestments.14015">Payments for (Proceeds from) Long-term Investments</link:label>
    <link:loc xlink:label="loc_PaymentsForProceedsFromShortTermInvestments.14239.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForProceedsFromShortTermInvestments" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PaymentsForProceedsFromShortTermInvestments.14239.11.6" xlink:to="lab_PaymentsForProceedsFromShortTermInvestments.13949" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PaymentsForProceedsFromShortTermInvestments.13949" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_PaymentsForProceedsFromShortTermInvestments.13949">Payments for (Proceeds from) Short-term Investments</link:label>
    <link:loc xlink:label="loc_PaymentsForProceedsFromShortTermInvestments.14239.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsForProceedsFromShortTermInvestments" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PaymentsForProceedsFromShortTermInvestments.14239.11.52" xlink:to="lab_PaymentsForProceedsFromShortTermInvestments46.1835464.413067.358859" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PaymentsForProceedsFromShortTermInvestments46.1835464.413067.358859" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_PaymentsForProceedsFromShortTermInvestments46.1835464.413067.358859">Repayment of (Investment in) short-term deposits</link:label>
    <link:loc xlink:label="loc_PaymentsToAcquireAvailableForSaleSecurities.14334.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecurities" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PaymentsToAcquireAvailableForSaleSecurities.14334.11.6" xlink:to="lab_PaymentsToAcquireAvailableForSaleSecurities.14093" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PaymentsToAcquireAvailableForSaleSecurities.14093" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_PaymentsToAcquireAvailableForSaleSecurities.14093">Payments to Acquire Available-for-sale Securities</link:label>
    <link:loc xlink:label="loc_PaymentsToAcquireAvailableForSaleSecurities.14334.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecurities" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PaymentsToAcquireAvailableForSaleSecurities.14334.11.52" xlink:to="lab_PaymentsToAcquireAvailableForSaleSecurities7.1887952.358863" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PaymentsToAcquireAvailableForSaleSecurities7.1887952.358863" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_PaymentsToAcquireAvailableForSaleSecurities7.1887952.358863">Investment in available-for-sale marketable securities</link:label>
    <link:loc xlink:label="loc_PaymentsToAcquirePropertyPlantAndEquipment.14347.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PaymentsToAcquirePropertyPlantAndEquipment.14347.11.6" xlink:to="lab_PaymentsToAcquirePropertyPlantAndEquipment.6526.253882.250432" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PaymentsToAcquirePropertyPlantAndEquipment.6526.253882.250432" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_PaymentsToAcquirePropertyPlantAndEquipment.6526.253882.250432">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:label="loc_PaymentsToAcquirePropertyPlantAndEquipment.14347.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:type="locator" />
    <link:labelArc xlink:from="loc_PaymentsToAcquirePropertyPlantAndEquipment.14347.11.52" xlink:to="lab_PaymentsToAcquirePropertyPlantAndEquipment7.286782.253883.250433" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_PaymentsToAcquirePropertyPlantAndEquipment7.286782.253883.250433" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_PaymentsToAcquirePropertyPlantAndEquipment7.286782.253883.250433">Purchase of property and equipment</link:label>
    <link:loc xlink:label="loc_ProceedsFromIssuanceOfCommonStock.15031.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ProceedsFromIssuanceOfCommonStock.15031.11.6" xlink:to="lab_ProceedsFromIssuanceOfCommonStock.6186.253886.250436" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ProceedsFromIssuanceOfCommonStock.6186.253886.250436" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ProceedsFromIssuanceOfCommonStock.6186.253886.250436">Proceeds from Issuance of Common Stock</link:label>
    <link:loc xlink:label="loc_ProceedsFromIssuanceOfCommonStock.15031.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ProceedsFromIssuanceOfCommonStock.15031.11.7" xlink:to="lab_ProceedsFromIssuanceOfCommonStock7.286798.253887.250437" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ProceedsFromIssuanceOfCommonStock7.286798.253887.250437" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ProceedsFromIssuanceOfCommonStock7.286798.253887.250437">Issuance of common stock and warrants, net of issuance costs</link:label>
    <link:loc xlink:label="loc_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions.15108.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions.15108.11.6" xlink:to="lab_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions.12564.253890.250440" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions.12564.253890.250440" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions.12564.253890.250440">Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options</link:label>
    <link:loc xlink:label="loc_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions.15108.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions.15108.11.7" xlink:to="lab_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions7.286799.253891.250441" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities.15016.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities" xlink:type="locator" />
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    <link:loc xlink:label="loc_CostOfRevenue.7431.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CostOfRevenue" xlink:type="locator" />
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    <link:loc xlink:label="loc_EarningsPerShareAbstract.1761.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_EarningsPerShareAbstract.10391.253734.250488" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EarningsPerShareAbstract.10391.253734.250488">Earnings Per Share [Abstract]</link:label>
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    <link:label xlink:label="lab_EarningsPerShareAbstract.286731.253735.250489" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_EarningsPerShareAbstract.286731.253735.250489">Loss per share:</link:label>
    <link:loc xlink:label="loc_EarningsPerShareBasicAndDiluted.9078.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:type="locator" />
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    <link:label xlink:label="lab_EarningsPerShareBasicAndDiluted.12855.253736.250490" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EarningsPerShareBasicAndDiluted.12855.253736.250490">Earnings Per Share, Basic and Diluted</link:label>
    <link:loc xlink:label="loc_EarningsPerShareBasicAndDiluted.9078.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:type="locator" />
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    <link:label xlink:label="lab_EarningsPerShareBasicAndDiluted7.286732.253737.250491" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_EarningsPerShareBasicAndDiluted7.286732.253737.250491">Basic and diluted net loss per share</link:label>
    <link:loc xlink:label="loc_GeneralAndAdministrativeExpense.10699.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:type="locator" />
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    <link:label xlink:label="lab_GeneralAndAdministrativeExpense.3393.253741.250495" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_GeneralAndAdministrativeExpense.3393.253741.250495">General and Administrative Expense</link:label>
    <link:loc xlink:label="loc_GeneralAndAdministrativeExpense.10699.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:type="locator" />
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    <link:label xlink:label="lab_GeneralAndAdministrativeExpense46.333718.253742.250496" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_GeneralAndAdministrativeExpense46.333718.253742.250496">General and administrative expenses</link:label>
    <link:loc xlink:label="loc_GovernmentAndThirdPartyGrantsReceived.28747.11.6" xlink:href="psti-20140331.xsd#psti_GovernmentAndThirdPartyGrantsReceived" xlink:type="locator" />
    <link:labelArc xlink:from="loc_GovernmentAndThirdPartyGrantsReceived.28747.11.6" xlink:to="lab_GovernmentAndThirdPartyGrantsReceived.250503" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_GovernmentAndThirdPartyGrantsReceived.250503" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_GovernmentAndThirdPartyGrantsReceived.250503">Government And Third Party Grants Received</link:label>
    <link:loc xlink:label="loc_GovernmentAndThirdPartyGrantsReceived.28747.11.7" xlink:href="psti-20140331.xsd#psti_GovernmentAndThirdPartyGrantsReceived" xlink:type="locator" />
    <link:labelArc xlink:from="loc_GovernmentAndThirdPartyGrantsReceived.28747.11.7" xlink:to="lab_GovernmentAndThirdPartyGrantsReceived.250505" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_GovernmentAndThirdPartyGrantsReceived.250505" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_GovernmentAndThirdPartyGrantsReceived.250505">Less participation by the Office of the Chief Scientist and other parties</link:label>
    <link:loc xlink:label="loc_GovernmentAndThirdPartyGrantsReceived.28747.11.12" xlink:href="psti-20140331.xsd#psti_GovernmentAndThirdPartyGrantsReceived" xlink:type="locator" />
    <link:labelArc xlink:from="loc_GovernmentAndThirdPartyGrantsReceived.28747.11.12" xlink:to="lab_GovernmentAndThirdPartyGrantsReceived.250504" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_GovernmentAndThirdPartyGrantsReceived.250504" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_GovernmentAndThirdPartyGrantsReceived.250504">Grants received from the government and third parties for research and development programs.</link:label>
    <link:loc xlink:label="loc_GrossProfit.10776.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GrossProfit" xlink:type="locator" />
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    <link:label xlink:label="lab_GrossProfit.1921805.253744.250497" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_GrossProfit.1921805.253744.250497">Gross profit</link:label>
    <link:loc xlink:label="loc_GrossProfit.10776.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GrossProfit" xlink:type="locator" />
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    <link:label xlink:label="lab_GrossProfit.3430.253743.250498" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_GrossProfit.3430.253743.250498">Gross Profit</link:label>
    <link:loc xlink:label="loc_IncomeStatementAbstract.2649.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:type="locator" />
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    <link:label xlink:label="lab_IncomeStatementAbstract.286714.253745.250499" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncomeStatementAbstract.286714.253745.250499">CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]</link:label>
    <link:loc xlink:label="loc_NetIncomeLoss.13265.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NetIncomeLoss" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NetIncomeLoss.13265.11.9" xlink:to="lab_NetIncomeLoss.286730.253746.250500" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NetIncomeLoss.286730.253746.250500" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetIncomeLoss.286730.253746.250500">Net loss for the period</link:label>
    <link:loc xlink:label="loc_NonoperatingIncomeExpense.13395.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:type="locator" />
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    <link:label xlink:label="lab_NonoperatingIncomeExpense.12540" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NonoperatingIncomeExpense.12540">Nonoperating Income (Expense)</link:label>
    <link:loc xlink:label="loc_NonoperatingIncomeExpense.13395.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:type="locator" />
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    <link:loc xlink:label="loc_OperatingIncomeLoss.13592.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:type="locator" />
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    <link:label xlink:label="lab_OperatingIncomeLoss.286726.253748.250501" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_OperatingIncomeLoss.286726.253748.250501">Operating loss</link:label>
    <link:loc xlink:label="loc_OperatingIncomeLoss.13592.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:type="locator" />
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    <link:label xlink:label="lab_OperatingIncomeLoss.5320.253747.250502" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_OperatingIncomeLoss.5320.253747.250502">Operating Income (Loss)</link:label>
    <link:loc xlink:label="loc_ResearchAndDevelopmentExpense.15880.11.52" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:type="locator" />
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    <link:loc xlink:label="loc_ResearchAndDevelopmentExpense.15880.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:type="locator" />
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    <link:loc xlink:label="loc_ResearchAndDevelopmentExpensesNet.28758.11.6" xlink:href="psti-20140331.xsd#psti_ResearchAndDevelopmentExpensesNet" xlink:type="locator" />
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    <link:loc xlink:label="loc_Revenues.16160.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_Revenues" xlink:type="locator" />
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    <link:loc xlink:label="loc_WeightedAverageNumberOfShareOutstandingBasicAndDiluted.18039.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:type="locator" />
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    <link:label xlink:label="lab_AdditionalPaidInCapitalMember.11419.253944.250778" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AdditionalPaidInCapitalMember.11419.253944.250778">Additional Paid-in Capital [Member]</link:label>
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    <link:label xlink:label="lab_CommonStockMember.8433.253945.250779" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CommonStockMember.8433.253945.250779">Common Stock [Member]</link:label>
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    <link:loc xlink:label="loc_EquityComponentDomain.1873.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EquityComponentDomain" xlink:type="locator" />
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    <link:label xlink:label="lab_NetIncomeLoss.493231.250813" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US" id="lab_NetIncomeLoss.493231.250813">Net loss</link:label>
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    <link:loc xlink:label="loc_RetainedEarningsMember.4652.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:type="locator" />
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    <link:loc xlink:label="loc_StatementEquityComponentsAxis.5169.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:type="locator" />
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    <link:loc xlink:label="loc_StatementOfStockholdersEquityAbstract.5166.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:type="locator" />
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    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesNewIssues.17271.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:type="locator" />
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    <link:loc xlink:label="loc_AvailableForSaleSecuritiesAmortizedCost.6209.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesAmortizedCost.6209.11.6" xlink:to="lab_AvailableForSaleSecuritiesAmortizedCost.1336" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesAmortizedCost.1336" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesAmortizedCost.1336">Available-for-sale Securities, Amortized Cost Basis</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesAmortizedCost.6209.11.9" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:type="locator" />
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    <link:label xlink:label="lab_AvailableForSaleSecuritiesAmortizedCost.358793" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesAmortizedCost.358793">Amortized cost</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.35144.11.6" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.35144.11.6" xlink:to="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.310998" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.310998" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.310998">Available For Sale Securities Gross Unrealized Gain Accumulated In Aoci</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.35144.11.7" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.35144.11.7" xlink:to="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.311000" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.311000" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.311000">Gross unrealized gain</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.35144.11.12" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.35144.11.12" xlink:to="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.310999" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.310999" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInAoci.310999">Amount of accumulated pre-tax unrealized gains on investments in available-for-sale securities that are recognized in Accumulated Other Comprehensive Income (AOCI).</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.35145.11.6" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.35145.11.6" xlink:to="lab_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.311001" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.311001" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.311001">Available For Sale Securities Gross Unrealized Loss Accumulated In Aoci</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.35145.11.12" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.35145.11.12" xlink:to="lab_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.311003" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.311003" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInAoci.311003">Amount of accumulated pre-tax unrealized loss before deducting unrealized gain on investments in available-for-sale securities recognized in Accumulated Other Comprehensive Income (AOCI).</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.29053.11.6" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.29053.11.6" xlink:to="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.252998" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.252998" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.252998">Available For Sale Securities Matures After Five Years Through Ten Years [Member]</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.29053.11.7" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.29053.11.7" xlink:to="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.253000" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.253000" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.253000">After Five Years through Ten Years [Member]</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.29053.11.12" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.29053.11.12" xlink:to="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.252999" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.252999" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesAfterFiveYearsThroughTenYearsMember.252999">Available-for-sale securities with maturities after five years and within ten years.</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.29052.11.6" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.29052.11.6" xlink:to="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252995" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252995" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252995">Available For Sale Securities Matures After One Year Through Five Years [Member]</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.29052.11.7" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.29052.11.7" xlink:to="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252997" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252997" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252997">One to Five Years [Member]</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.29052.11.12" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.29052.11.12" xlink:to="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252996" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252996" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesAfterOneYearThroughFiveYearsMember.252996">Available-for sale securities with maturities between one and five years.</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesWithinOneYearMember.29051.11.6" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesWithinOneYearMember.29051.11.6" xlink:to="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252991" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252991" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252991">Available For Sale Securities Matures Within One Year [Member]</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesWithinOneYearMember.29051.11.7" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesWithinOneYearMember.29051.11.7" xlink:to="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252994" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252994" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252994">Within One Year [Member]</link:label>
    <link:loc xlink:label="loc_AvailableForSaleSecuritiesMaturesWithinOneYearMember.29051.11.12" xlink:href="psti-20140331.xsd#psti_AvailableForSaleSecuritiesMaturesWithinOneYearMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AvailableForSaleSecuritiesMaturesWithinOneYearMember.29051.11.12" xlink:to="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252993" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252993" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_AvailableForSaleSecuritiesMaturesWithinOneYearMember.252993">Available-for-sale securities with maturites within the nex year.</link:label>
    <link:loc xlink:label="loc_CorporateDebtSecuritiesMember.1234.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_CorporateDebtSecuritiesMember.1234.11.6" xlink:to="lab_CorporateDebtSecuritiesMember.1640.254058.250599" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_CorporateDebtSecuritiesMember.1640.254058.250599" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CorporateDebtSecuritiesMember.1640.254058.250599">Corporate Debt Securities [Member]</link:label>
    <link:loc xlink:label="loc_CorporateDebtSecuritiesMember.1234.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_CorporateDebtSecuritiesMember.1234.11.7" xlink:to="lab_CorporateDebtSecuritiesMember.1900069.358840" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_CorporateDebtSecuritiesMember.1900069.358840" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_CorporateDebtSecuritiesMember.1900069.358840">Corporate debentures [Member]</link:label>
    <link:loc xlink:label="loc_FixedIncomeSecuritiesMember.2326.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_FixedIncomeSecuritiesMember.2326.11.6" xlink:to="lab_FixedIncomeSecuritiesMember.7686" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_FixedIncomeSecuritiesMember.7686" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_FixedIncomeSecuritiesMember.7686">Fixed Income Securities [Member]</link:label>
    <link:loc xlink:label="loc_FixedIncomeSecuritiesMember.2326.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FixedIncomeSecuritiesMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_FixedIncomeSecuritiesMember.2326.11.7" xlink:to="lab_FixedIncomeSecuritiesMember.358838" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_FixedIncomeSecuritiesMember.358838" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_FixedIncomeSecuritiesMember.358838">Stock and index linked notes [Member]</link:label>
    <link:loc xlink:label="loc_GovernmentDebtSecuritiesMember.28717.11.12" xlink:href="psti-20140331.xsd#psti_GovernmentDebtSecuritiesMember" xlink:type="locator" />
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    <link:label xlink:label="lab_GovernmentDebenturesMember.1921836.254061.250601" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_GovernmentDebenturesMember.1921836.254061.250601">Debt securities issued by a national, local, or municipal government.</link:label>
    <link:loc xlink:label="loc_GovernmentDebtSecuritiesMember.28717.11.6" xlink:href="psti-20140331.xsd#psti_GovernmentDebtSecuritiesMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_GovernmentDebtSecuritiesMember.28717.11.6" xlink:to="lab_GovernmentDebtSecuritiesMember.250600" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_GovernmentDebtSecuritiesMember.250600" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_GovernmentDebtSecuritiesMember.250600">Government Debt Securities [Member]</link:label>
    <link:loc xlink:label="loc_MajorTypesOfDebtAndEquitySecuritiesAxis.3313.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:type="locator" />
    <link:labelArc xlink:from="loc_MajorTypesOfDebtAndEquitySecuritiesAxis.3313.11.6" xlink:to="lab_MajorTypesOfDebtAndEquitySecuritiesAxis.11217.250602" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_MajorTypesOfDebtAndEquitySecuritiesAxis.11217.250602" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_MajorTypesOfDebtAndEquitySecuritiesAxis.11217.250602">Major Types of Debt and Equity Securities [Axis]</link:label>
    <link:loc xlink:label="loc_MajorTypesOfDebtAndEquitySecuritiesDomain.3315.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:type="locator" />
    <link:labelArc xlink:from="loc_MajorTypesOfDebtAndEquitySecuritiesDomain.3315.11.6" xlink:to="lab_MajorTypesOfDebtAndEquitySecuritiesDomain.14470.254062.250603" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_MajorTypesOfDebtAndEquitySecuritiesDomain.14470.254062.250603" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_MajorTypesOfDebtAndEquitySecuritiesDomain.14470.254062.250603">Major Types of Debt and Equity Securities [Domain]</link:label>
    <link:loc xlink:label="loc_ScheduleOfAvailableForSaleSecuritiesLineItems.4805.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfAvailableForSaleSecuritiesLineItems.4805.11.6" xlink:to="lab_ScheduleOfAvailableForSaleSecuritiesLineItems.10586.254064.250604" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfAvailableForSaleSecuritiesLineItems.10586.254064.250604" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfAvailableForSaleSecuritiesLineItems.10586.254064.250604">Schedule of Available-for-sale Securities [Line Items]</link:label>
    <link:loc xlink:label="loc_ScheduleOfAvailableForSaleSecuritiesTable.4765.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfAvailableForSaleSecuritiesTable.4765.11.6" xlink:to="lab_ScheduleOfAvailableForSaleSecuritiesTable.8554.254066.250605" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:label xlink:label="lab_FairValueHedgingMember.7101" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_FairValueHedgingMember.7101">Fair Value Hedging [Member]</link:label>
    <link:loc xlink:label="loc_FairValueHedgingMember.2174.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValueHedgingMember" xlink:type="locator" />
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    <link:label xlink:label="lab_FairValueHedgingMember.360249" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_FairValueHedgingMember.360249">Fair value [Member]</link:label>
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    <link:loc xlink:label="loc_BasisOfAccountingPolicyPolicyTextBlock.6323.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:type="locator" />
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    <link:loc xlink:label="loc_BasisOfAccountingPolicyPolicyTextBlock.6323.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:type="locator" />
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    <link:labelArc xlink:from="loc_CommonStockAggregateOfferingPriceAuthorized.40986.11.12" xlink:to="CommonStockAggregateOfferingPriceAuthorized.358856" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="CommonStockAggregateOfferingPriceAuthorized.358856" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="CommonStockAggregateOfferingPriceAuthorized.358856">The maximum aggregate offering price of common shares permitted to be issued.</link:label>
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    <link:labelArc xlink:from="loc_AwardTypeAxis.359.11.6" xlink:to="lab_AwardTypeAxis.250.250698" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AwardTypeAxis.250.250698" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AwardTypeAxis.250.250698">Award Type [Axis]</link:label>
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    <link:label xlink:label="lab_CommonStockAggregateOfferingPriceAuthorized.358854" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_CommonStockAggregateOfferingPriceAuthorized.358854">Common Stock Aggregate Offering Price Authorized</link:label>
    <link:loc xlink:label="loc_ConversionOfStockSharesConverted1.7346.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ConversionOfStockSharesConverted1.7346.11.6" xlink:to="lab_ConversionOfStockSharesConverted1.3201" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ConversionOfStockSharesConverted1.3201" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ConversionOfStockSharesConverted1.3201">Conversion of Stock, Shares Converted</link:label>
    <link:loc xlink:label="loc_ConversionOfStockSharesConverted1.7346.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConversionOfStockSharesConverted1" xlink:type="locator" />
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    <link:label xlink:label="lab_ConversionOfStockSharesConverted1.275901.360257" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ConversionOfStockSharesConverted1.275901.360257">Warrants exercised via cashless exercise</link:label>
    <link:loc xlink:label="loc_ConversionOfStockSharesIssued1.7335.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1" xlink:type="locator" />
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    <link:label xlink:label="lab_ConversionOfStockSharesIssued1.3187" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ConversionOfStockSharesIssued1.3187">Conversion of Stock, Shares Issued</link:label>
    <link:loc xlink:label="loc_ConversionOfStockSharesIssued1.7335.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1" xlink:type="locator" />
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    <link:label xlink:label="lab_ConversionOfStockSharesIssued1.1870139.310643.360258" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ConversionOfStockSharesIssued1.1870139.310643.360258">Warrants exercised via cashless exercise, shares issued</link:label>
    <link:loc xlink:label="loc_EmployeeStockOptionMember.1806.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_EmployeeStockOptionMember.1806.11.6" xlink:to="lab_EmployeeStockOptionMember.5884" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_EmployeeStockOptionMember.5884" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EmployeeStockOptionMember.5884">Employee Stock Option [Member]</link:label>
    <link:loc xlink:label="loc_EmployeeStockOptionMember.1806.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_EmployeeStockOptionMember.1806.11.7" xlink:to="lab_EmployeeStockOptionMember.327665" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_EmployeeStockOptionMember.327665" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_EmployeeStockOptionMember.327665">Options [Member]</link:label>
    <link:loc xlink:label="loc_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable.4883.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable.4883.11.6" xlink:to="lab_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable.7669.254234.250721" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable.7669.254234.250721" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable.7669.254234.250721">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems.5072.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems.5072.11.6" xlink:to="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems.7668.254244.250722" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems.7668.254244.250722" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems.7668.254244.250722">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
    <link:loc xlink:label="loc_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain.5086.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain.5086.11.6" xlink:to="lab_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain.14534.254245.250757" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.28766.11.7" xlink:href="psti-20140331.xsd#psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.28766.11.7" xlink:to="lab_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.363404" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.363404" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.363404">Options and warrants exercised</link:label>
    <link:loc xlink:label="loc_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.28766.11.6" xlink:href="psti-20140331.xsd#psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.28766.11.6" xlink:to="lab_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.1921983.254157.250623" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.1921983.254157.250623" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.1921983.254157.250623">Sharebased Goods And Nonemployees Services Transaction Warrants And Options Exercised</link:label>
    <link:loc xlink:label="loc_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised.28766.11.12" xlink:href="psti-20140331.xsd#psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsExercised" xlink:type="locator" />
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    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesNewIssues.17271.11.8" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:type="locator" />
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    <link:label xlink:label="lab_StockIssuedDuringPeriodSharesNewIssues.1922127.254328.250919" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US" id="lab_StockIssuedDuringPeriodSharesNewIssues.1922127.254328.250919">Shares of common stock issued</link:label>
    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesOther.17244.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:type="locator" />
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    <link:label xlink:label="lab_StockIssuedDuringPeriodSharesOther.18652" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_StockIssuedDuringPeriodSharesOther.18652">Stock Issued During Period, Shares, Other</link:label>
    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesOther.17244.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesOther" xlink:type="locator" />
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    <link:label xlink:label="lab_StockIssuedDuringPeriodSharesOther.537695.360259" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_StockIssuedDuringPeriodSharesOther.537695.360259">Warrants exercised for cash</link:label>
    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesStockOptionsExercised.17264.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:type="locator" />
    <link:labelArc xlink:from="loc_StockIssuedDuringPeriodSharesStockOptionsExercised.17264.11.6" xlink:to="lab_StockIssuedDuringPeriodSharesStockOptionsExercised.11705.254133.250829" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_StockIssuedDuringPeriodSharesStockOptionsExercised.11705.254133.250829" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_StockIssuedDuringPeriodSharesStockOptionsExercised.11705.254133.250829">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period</link:label>
    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesStockOptionsExercised.17264.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:type="locator" />
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    <link:loc xlink:label="loc_WarrantAwardsMember.41390.11.6" xlink:href="psti-20140331.xsd#psti_WarrantAwardsMember" xlink:type="locator" />
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    <link:label xlink:label="lab_WarrantAwardsMember.363405" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_WarrantAwardsMember.363405">Warrant Awards [Member]</link:label>
    <link:loc xlink:label="loc_StockIssuedDuringPeriodSharesStockOptionsAndWarrantsExercised.41141.11.8" xlink:href="psti-20140331.xsd#psti_StockIssuedDuringPeriodSharesStockOptionsAndWarrantsExercised" xlink:type="locator" />
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    <link:label xlink:label="WarrantAwardsMember.363407" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="WarrantAwardsMember.363407">Warrants [Member]</link:label>
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    <link:label xlink:label="WarrantAwardsMember.363406" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="WarrantAwardsMember.363406">Award that gives the holder the right to purchase shares of stock in accordance with the terms of the instrument, usually upon payment of a specified amount.</link:label>
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    <link:loc xlink:label="loc_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsGranted.28767.11.6" xlink:href="psti-20140331.xsd#psti_SharebasedGoodsAndNonemployeesServicesTransactionWarrantsAndOptionsGranted" xlink:type="locator" />
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    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward.5085.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:type="locator" />
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    <link:label xlink:label="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward.11886.254118.250742" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward.11886.254118.250742">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]</link:label>
    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward.5085.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:type="locator" />
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    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice.16982.11.10" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:type="locator" />
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    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice.16982.11.11" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:type="locator" />
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    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice.16982.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice.16982.11.6" xlink:to="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice.7646.254120.250746" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice.7646.254120.250746" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice.7646.254120.250746">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
    <link:loc xlink:label="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.16219.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.16219.11.6" xlink:to="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.16368.250747" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.16368.250747" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.16368.250747">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:label="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.16219.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.16219.11.7" xlink:to="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.254521.250748" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.254521.250748" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2.254521.250748">Options outstanding at end of the period</link:label>
    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue.16984.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue.16984.11.6" xlink:to="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue.11913.254125.250749" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue.11913.254125.250749" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue.11913.254125.250749">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value</link:label>
    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue.16984.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue.16984.11.7" xlink:to="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue7.1921945.254126.250750" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue7.1921945.254126.250750" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue7.1921945.254126.250750">Options vested</link:label>
    <link:loc xlink:label="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.16218.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.16218.11.6" xlink:to="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.16366.250751" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.16366.250751" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.16366.250751">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:label="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.16218.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.16218.11.7" xlink:to="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.254519.250752" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.254519.250752" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1.254519.250752">Options vested</link:label>
    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber.17000.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber.17000.11.6" xlink:to="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber.11918.254129.250753" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber.11918.254129.250753" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber.11918.254129.250753">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number</link:label>
    <link:loc xlink:label="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice.17008.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice.17008.11.6" xlink:to="lab_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice.11911.254131.250755" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:labelArc xlink:from="loc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod.16881.11.7" xlink:to="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod.1858164.254246.250712" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod.1858164.254246.250712" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod.1858164.254246.250712">Granted</link:label>
    <link:loc xlink:label="loc_ConsultantRestrictedStockUnitsMember.28707.11.6" xlink:href="psti-20140331.xsd#psti_ConsultantRestrictedStockUnitsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ConsultantRestrictedStockUnitsMember.28707.11.6" xlink:to="lab_ConsultantRestrictedStockUnitsMember.250699" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ConsultantRestrictedStockUnitsMember.250699" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ConsultantRestrictedStockUnitsMember.250699">Consultant Restricted Stock Units [Member]</link:label>
    <link:loc xlink:label="loc_ConsultantRestrictedStockUnitsMember.28707.11.7" xlink:href="psti-20140331.xsd#psti_ConsultantRestrictedStockUnitsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ConsultantRestrictedStockUnitsMember.28707.11.7" xlink:to="lab_ConsultantRestrictedStockUnitsMember.327664" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ConsultantRestrictedStockUnitsMember.327664" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ConsultantRestrictedStockUnitsMember.327664">Consultant restricted stock units [Member]</link:label>
    <link:loc xlink:label="loc_ConsultantRestrictedStockUnitsMember.28707.11.12" xlink:href="psti-20140331.xsd#psti_ConsultantRestrictedStockUnitsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ConsultantRestrictedStockUnitsMember.28707.11.12" xlink:to="lab_ConsultantRestrictedStockUnitsMember.250700" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ConsultantRestrictedStockUnitsMember.250700" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_ConsultantRestrictedStockUnitsMember.250700">Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met, issued to consultants.</link:label>
    <link:loc xlink:label="loc_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock.16476.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock.16476.11.6" xlink:to="lab_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock.14110.254378.250925" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock.14110.254378.250925" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock.14110.254378.250925">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]</link:label>
    <link:loc xlink:label="loc_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock.16476.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock.16476.11.7" xlink:to="lab_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock7.1922196.254379.250926" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock7.1922196.254379.250926" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock7.1922196.254379.250926">Schedule of Stock-based Compensation Expenses</link:label>
    <link:loc xlink:label="loc_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.16386.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.16386.11.6" xlink:to="lab_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.13776.254380.250927" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.13776.254380.250927" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.13776.254380.250927">Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]</link:label>
    <link:loc xlink:label="loc_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.16386.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.16386.11.7" xlink:to="lab_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.1922194.254381.250928" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.1922194.254381.250928" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock.1922194.254381.250928">Schedule of Unvested Restricted Stock Units</link:label>
    <link:loc xlink:label="loc_ScheduleOfShareBasedCompensationActivityTableTextBlock.16393.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfShareBasedCompensationActivityTableTextBlock.16393.11.6" xlink:to="lab_ScheduleOfShareBasedCompensationActivityTableTextBlock.17289" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfShareBasedCompensationActivityTableTextBlock.17289" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfShareBasedCompensationActivityTableTextBlock.17289">Schedule of Share-based Compensation, Activity [Table Text Block]</link:label>
    <link:loc xlink:label="loc_ScheduleOfShareBasedCompensationActivityTableTextBlock.16393.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfShareBasedCompensationActivityTableTextBlock.16393.11.7" xlink:to="lab_ScheduleOfShareBasedCompensationActivityTableTextBlock.135278.327666" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfShareBasedCompensationActivityTableTextBlock.135278.327666" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfShareBasedCompensationActivityTableTextBlock.135278.327666">Schedule of Stock Option and Warrant Activity</link:label>
    <link:loc xlink:label="loc_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock.16335.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock.16335.11.6" xlink:to="lab_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock.13789.254384.250931" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock.13789.254384.250931" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock.13789.254384.250931">Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]</link:label>
    <link:loc xlink:label="loc_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock.16335.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock.16335.11.7" xlink:to="lab_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock7.1922192.254385.250932" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock7.1922192.254385.250932" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock7.1922192.254385.250932">Schedule of Stock Option Activity</link:label>
    <link:loc xlink:label="loc_StockholdersEquityNoteLineItems.28775.11.6" xlink:href="psti-20140331.xsd#psti_StockholdersEquityNoteLineItems" xlink:type="locator" />
    <link:labelArc xlink:from="loc_StockholdersEquityNoteLineItems.28775.11.6" xlink:to="lab_StockholdersEquityNoteLineItems.1921953.254174.250914" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_StockholdersEquityNoteLineItems.1921953.254174.250914" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_StockholdersEquityNoteLineItems.1921953.254174.250914">Stockholders Equity Note [Line Items]</link:label>
    <link:loc xlink:label="loc_StockholdersEquityNoteLineItems.28775.11.12" xlink:href="psti-20140331.xsd#psti_StockholdersEquityNoteLineItems" xlink:type="locator" />
    <link:labelArc xlink:from="loc_StockholdersEquityNoteLineItems.28775.11.12" xlink:to="lab_StockholdersEquityNoteLineItems.1921954.254175.250915" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_StockholdersEquityNoteLineItems.1921954.254175.250915" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_StockholdersEquityNoteLineItems.1921954.254175.250915">Stockholders' Equity Note [Line Items].</link:label>
    <link:loc xlink:label="loc_StockholdersEquityNoteTable.28776.11.6" xlink:href="psti-20140331.xsd#psti_StockholdersEquityNoteTable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_StockholdersEquityNoteTable.28776.11.6" xlink:to="lab_StockholdersEquityNoteTable.1921949.254176.250916" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_StockholdersEquityNoteTable.1921949.254176.250916" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_StockholdersEquityNoteTable.1921949.254176.250916">Stockholders Equity Note [Table]</link:label>
    <link:loc xlink:label="loc_StockholdersEquityNoteTable.28776.11.12" xlink:href="psti-20140331.xsd#psti_StockholdersEquityNoteTable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_StockholdersEquityNoteTable.28776.11.12" xlink:to="lab_StockholdersEquityNoteTable.1921950.254177.250917" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_StockholdersEquityNoteTable.1921950.254177.250917" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="lab_StockholdersEquityNoteTable.1921950.254177.250917">Stockholders' Equity Note [Table].</link:label>
    <link:loc xlink:label="loc_SubsequentEventsAbstract.5215.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventsAbstract" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SubsequentEventsAbstract.5215.11.6" xlink:to="lab_SubsequentEventsAbstract.250976" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SubsequentEventsAbstract.250976" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_SubsequentEventsAbstract.250976">SUBSEQUENT EVENTS [Abstract]</link:label>
    <link:loc xlink:label="loc_SubsequentEventsTextBlock.17331.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SubsequentEventsTextBlock.17331.11.6" xlink:to="lab_SubsequentEventsTextBlock.18785" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SubsequentEventsTextBlock.18785" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_SubsequentEventsTextBlock.18785">Subsequent Events [Text Block]</link:label>
    <link:loc xlink:label="loc_SubsequentEventsTextBlock.17331.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:type="locator" />
    <link:labelArc xlink:from="loc_SubsequentEventsTextBlock.17331.11.7" xlink:to="lab_SubsequentEventsTextBlock.223409.250977" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_SubsequentEventsTextBlock.223409.250977" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_SubsequentEventsTextBlock.223409.250977">SUBSEQUENT EVENTS</link:label>
    <link:loc xlink:label="loc_BalanceSheetLocationAxis.707.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:type="locator" />
    <link:labelArc xlink:from="loc_BalanceSheetLocationAxis.707.11.6" xlink:to="lab_BalanceSheetLocationAxis.1447" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_BalanceSheetLocationAxis.1447" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_BalanceSheetLocationAxis.1447">Balance Sheet Location [Axis]</link:label>
    <link:loc xlink:label="loc_BalanceSheetLocationDomain.709.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:type="locator" />
    <link:labelArc xlink:from="loc_BalanceSheetLocationDomain.709.11.6" xlink:to="lab_BalanceSheetLocationDomain.1449" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_BalanceSheetLocationDomain.1449" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_BalanceSheetLocationDomain.1449">Balance Sheet Location [Domain]</link:label>
    <link:loc xlink:label="loc_DerivativesFairValueLineItems.1599.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:type="locator" />
    <link:labelArc xlink:from="loc_DerivativesFairValueLineItems.1599.11.6" xlink:to="lab_DerivativesFairValueLineItems.4976" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_DerivativesFairValueLineItems.4976" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_DerivativesFairValueLineItems.4976">Derivatives, Fair Value [Line Items]</link:label>
    <link:loc xlink:label="loc_DesignatedAsHedgingInstrumentMember.1328.11.8" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:type="locator" />
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    <link:label xlink:label="lab_DesignatedAsHedgingInstrumentMember8.217134.363278" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US" id="lab_DesignatedAsHedgingInstrumentMember8.217134.363278">Derivatives designated as hedge instruments [Member]</link:label>
    <link:loc xlink:label="loc_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable.2173.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:type="locator" />
    <link:labelArc xlink:from="loc_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable.2173.11.6" xlink:to="lab_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable.7100" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable.7100" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable.7100">Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]</link:label>
    <link:loc xlink:label="loc_ForeignCurrencyDerivativeAssetsAtFairValue.10409.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyDerivativeAssetsAtFairValue" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ForeignCurrencyDerivativeAssetsAtFairValue.10409.11.6" xlink:to="lab_ForeignCurrencyDerivativeAssetsAtFairValue.7766" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ForeignCurrencyDerivativeAssetsAtFairValue.7766" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ForeignCurrencyDerivativeAssetsAtFairValue.7766">Foreign Currency Derivative Assets at Fair Value</link:label>
    <link:loc xlink:label="loc_ForeignCurrencyDerivativeAssetsAtFairValue.10409.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ForeignCurrencyDerivativeAssetsAtFairValue" xlink:type="locator" />
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    <link:label xlink:label="lab_ForeignCurrencyDerivativeAssetsAtFairValue.196592.327137" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_ForeignCurrencyDerivativeAssetsAtFairValue.196592.327137">Foreign currency derivative assets</link:label>
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    <link:labelArc xlink:from="loc_ForeignCurrencyDerivativeLiabilitiesAtFairValue.10424.11.6" xlink:to="lab_ForeignCurrencyDerivativeLiabilitiesAtFairValue.7796" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:label xlink:label="lab_ForeignCurrencyDerivativeLiabilitiesAtFairValue.416704.360260" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US" id="lab_ForeignCurrencyDerivativeLiabilitiesAtFairValue.416704.360260">Foreign currency derivative liabilities</link:label>
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    <link:labelArc xlink:from="loc_NondesignatedMember.3627.11.6" xlink:to="lab_NondesignatedMember.12686" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NondesignatedMember.12686" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_NondesignatedMember.12686">Not Designated as Hedging Instrument [Member]</link:label>
    <link:loc xlink:label="loc_NondesignatedMember.3627.11.8" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_NondesignatedMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_NondesignatedMember.3627.11.8" xlink:to="lab_NondesignatedMember.363279" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_NondesignatedMember.363279" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US" id="lab_NondesignatedMember.363279">Derivatives not designated as hedge instruments [Member]</link:label>
    <link:loc xlink:label="loc_OtherCurrentAssetsMember.3768.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherCurrentAssetsMember.3768.11.6" xlink:to="lab_OtherCurrentAssetsMember.13194" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherCurrentAssetsMember.13194" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_OtherCurrentAssetsMember.13194">Other Current Assets [Member]</link:label>
    <link:loc xlink:label="loc_OtherCurrentAssetsMember.3768.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherCurrentAssetsMember.3768.11.7" xlink:to="lab_OtherCurrentAssetsMember.347699.358836" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherCurrentAssetsMember.347699.358836" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_OtherCurrentAssetsMember.347699.358836">Other current assets [Member]</link:label>
    <link:loc xlink:label="loc_OtherCurrentLiabilitiesMember.3731.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherCurrentLiabilitiesMember.3731.11.6" xlink:to="lab_OtherCurrentLiabilitiesMember.13001" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherCurrentLiabilitiesMember.13001" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_OtherCurrentLiabilitiesMember.13001">Other Current Liabilities [Member]</link:label>
    <link:loc xlink:label="loc_OtherCurrentLiabilitiesMember.3731.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_OtherCurrentLiabilitiesMember.3731.11.7" xlink:to="lab_OtherCurrentLiabilitiesMember.360242" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_OtherCurrentLiabilitiesMember.360242" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_OtherCurrentLiabilitiesMember.360242">Other current liabilities [Member]</link:label>
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    <link:labelArc xlink:from="loc_ConsultantsMember.40985.11.12" xlink:to="ConsultantsMember.358852" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="ConsultantsMember.358852" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="ConsultantsMember.358852">Non-employee consultants providing a serivce to the company.</link:label>
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    <link:labelArc xlink:from="loc_EquityOptionsAndWarrantsMember.28742.11.7" xlink:to="EquityOptionsAndWarrantsMember.327670" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="EquityOptionsAndWarrantsMember.327670" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="EquityOptionsAndWarrantsMember.327670">Options and warrants [Member]</link:label>
    <link:loc xlink:label="loc_EquityOptionsAndWarrantsMember.28742.11.12" xlink:href="psti-20140331.xsd#psti_EquityOptionsAndWarrantsMember" xlink:type="locator" />
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    <link:label xlink:label="EquityOptionsAndWarrantsMember.250619" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" id="EquityOptionsAndWarrantsMember.250619">Options and warrants issued as equity award compensation.</link:label>
    <link:loc xlink:label="loc_GeneralAndAdministrativeExpenseMember.2476.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_GeneralAndAdministrativeExpenseMember.2476.11.7" xlink:to="GeneralAndAdministrativeExpenseMember.222398" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="GeneralAndAdministrativeExpenseMember.222398" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="GeneralAndAdministrativeExpenseMember.222398">General and administrative expenses [Member]</link:label>
    <link:loc xlink:label="loc_AllocatedShareBasedCompensationExpense.5919.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AllocatedShareBasedCompensationExpense.5919.11.7" xlink:to="lab_AllocatedShareBasedCompensationExpense.1921946.254145.250611" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AllocatedShareBasedCompensationExpense.1921946.254145.250611" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_AllocatedShareBasedCompensationExpense.1921946.254145.250611">Compensation expenses</link:label>
    <link:loc xlink:label="loc_AllocatedShareBasedCompensationExpense.5919.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:type="locator" />
    <link:labelArc xlink:from="loc_AllocatedShareBasedCompensationExpense.5919.11.6" xlink:to="lab_AllocatedShareBasedCompensationExpense.2840.254144.250612" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_AllocatedShareBasedCompensationExpense.2840.254144.250612" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_AllocatedShareBasedCompensationExpense.2840.254144.250612">Allocated Share-based Compensation Expense</link:label>
    <link:loc xlink:label="loc_ConsultantsMember.40985.11.6" xlink:href="psti-20140331.xsd#psti_ConsultantsMember" xlink:type="locator" />
    <link:labelArc xlink:from="loc_ConsultantsMember.40985.11.6" xlink:to="lab_ConsultantsMember.358851" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_ConsultantsMember.358851" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ConsultantsMember.358851">Consultants [Member]</link:label>
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    <link:labelArc xlink:from="loc_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems.1805.11.6" xlink:to="lab_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems.5883" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems.5883" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems.5883">Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]</link:label>
    <link:loc xlink:label="loc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.9212.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:type="locator" />
    <link:labelArc xlink:from="loc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.9212.11.6" xlink:to="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.5908" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.5908" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.5908">Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized</link:label>
    <link:loc xlink:label="loc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.9212.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:type="locator" />
    <link:labelArc xlink:from="loc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.9212.11.7" xlink:to="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.1929623.516864.184538" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
    <link:label xlink:label="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.1929623.516864.184538" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized.1929623.516864.184538">Unrecognized compensation expense</link:label>
    <link:loc xlink:label="loc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1.9214.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:type="locator" />
    <link:labelArc xlink:from="loc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1.9214.11.6" xlink:to="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1.5912" order="1" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:type="arc" />
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    <link:loc xlink:label="loc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1.9214.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:type="locator" />
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    <link:label xlink:label="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1.522154.358868" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US" id="lab_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1.522154.358868">Unrecognized compensation expense, recognition period</link:label>
    <link:loc xlink:label="loc_EquityOptionsAndWarrantsMember.28742.11.6" xlink:href="psti-20140331.xsd#psti_EquityOptionsAndWarrantsMember" xlink:type="locator" />
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    <link:label xlink:label="lab_EquityOptionsAndWarrantsMember.250618" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_EquityOptionsAndWarrantsMember.250618">Equity Options And Warrants [Member]</link:label>
    <link:loc xlink:label="loc_GeneralAndAdministrativeExpenseMember.2476.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:type="locator" />
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    <link:label xlink:label="lab_GeneralAndAdministrativeExpenseMember.3392.254150.250617" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_GeneralAndAdministrativeExpenseMember.3392.254150.250617">General and Administrative Expense [Member]</link:label>
    <link:loc xlink:label="loc_IncomeStatementLocationAxis.2652.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:type="locator" />
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    <link:label xlink:label="lab_IncomeStatementLocationAxis.8839" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncomeStatementLocationAxis.8839">Income Statement Location [Axis]</link:label>
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    <link:label xlink:label="lab_IncomeStatementLocationDomain.8906" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_IncomeStatementLocationDomain.8906">Income Statement Location [Domain]</link:label>
    <link:loc xlink:label="loc_ResearchAndDevelopmentExpenseMember.4573.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:type="locator" />
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    <link:label xlink:label="lab_ResearchAndDevelopmentExpenseMember.14651.254153.250620" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US" id="lab_ResearchAndDevelopmentExpenseMember.14651.254153.250620">Research and Development Expense [Member]</link:label>
    <link:loc xlink:label="loc_RestrictedStockUnitsRSUMember.4601.11.6" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:type="locator" />
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    <link:loc xlink:label="loc_RestrictedStockUnitsRSUMember.4601.11.7" xlink:href="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:type="locator" />
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