Swanbio Therapeutics Inc. closed a $56 million series B round to take its lead gene therapy program, SBT-101, into clinical development later this year. The candidate, comprised of an adeno-associated virus type 9 vector encoding the ABCD1 peroxisomal ATP-binding cassette transporter, is in development for adrenomyeloneuropathy (AMN), an inherited disease that affects the central nervous system.