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Grant Receivable	12 Months Ended
Grant Receivable	Dec. 31, 2020
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 $1,157,449 and $735,075 for the years ended December 31, 2020 and 2019, respectively, in connection with the NIH grant. The Company received payments under the grant of $1,892,524 and $0 during the years ended December 31, 2020 and 2019, respectively and recorded a grant receivable of $0 and $735,075 as of December 31, 2020 and 2019, respectively, to reflect unreimbursed, eligible costs incurred under the grant. As of December 31, 2020, remaining funds available under the grant were $36,754.