VistaGen Therapeutics announced that its Investigational New Drug (IND) application for AV-101, the Company's oral NMDAR (N-methyl-D-aspartate receptor) glycine site antagonist, as a potential treatment of dyskinesia in patients with Parkinson's disease receiving levodopa-based therapy has been cleared by the U.S. Food and Drug Administration (FDA). The FDA's IND clearance permits VistaGen to proceed with Phase 2 clinical development of AV-101 in this indication. The Company also announced that the U.S. Patent and Trademark Office (USPTO) has issued a Notice of Allowance for U.S. Patent Application 16/003,816 related to therapeutic use of AV-101 for treatment of dyskinesia induced by the administration of levodopa. The patent, once issued, will be in effect until at least 2034.