Neurophth Therapeutics Inc. has received FDA clearance of its IND application for the in vivo gene replacement therapy NFS-02, a novel recombinant adeno-associated viral serotype 2 vector (rAAV2) containing a codon-optimized NADH-dehydrogenase subunit 1 (ND1) gene, for the treatment of Leber hereditary optic neuropathy (LHON) associated with ND1 mutation.