Passage Bio, Inc., a genetic medicines company, develops transformative therapies for central nervous system diseases.It develops PBGM01, which utilizes a proprietary, AAVhu68 capsid to deliver to the brain and peripheral tissues a functional GLB1 gene encoding lysososomal acid beta-galactosidase for infantile GM1. The company also develops PBML04 for the treatment of metachromatic leukodystrophy.