4. FIXED ASSETS

Fixed assets consisted of the following at December 31:


	2020		2019

Office and laboratory equipment	$	445,758	$	430,591
Computer software		4,000		4,000
Leasehold improvements		309,897		309,897
Total fixed assets		759,655		744,488
Less– accumulated depreciation and amortization		(403,673)		(309,405)
Fixed assets, net	$	355,982	$	435,083

For the years ended December 31, 2020 and 2019, the Company incurred approximately $141,000 and $133,000 of depreciation and amortization expense, respectively.