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Grant Receivable	3 Months Ended
Grant Receivable	Mar. 31, 2021
Grant Receivable
Grant Receivable	(4) Grant Receivable In September 2019, as modified in September 2020, the Company received a Notice of Award for a $1.9 million grant from the National Institute on Aging of the National Institutes of Health (the “NIH”) to cover costs of long-term chronic toxicology studies of ANVS401 in rats and dogs. The Company began the long-term chronic toxicology studies in November 2019. The Company recognized grant income of $29,340 and $157,438 for the three months ended March 31, 2021, and 2020, respectively, in connection with the NIH grant and received payments under the grant of $29,340 and $854,761 during the three months ended March 31, 2021 and 2020, respectively. The Company recorded a grant receivable of $0 as of March 31, 2021 and December 31, 2020, and had no unreimbursed, eligible costs incurred under the grant. As of March 31, 2021, remaining funds available under the grant were $7,414.