>5NH3_1|Chains A, B|Activin receptor type-2A|Homo sapiens (9606)
AILGRSETQECLFFNANWEKDRTNQTGVEPCYGDKDKRRHCFATWKNISGSIEIVKQGCWLDDINCYDRTDCVEKKDSPEVYFCCCEGNMCNEKFSYFPEMEVTQPTSNPVTPKPPEFRHDS
>5NH3_2|Chains C[auth H], D[auth I]|anti-human ActRIIB mAb BYM338 Fv heavy-chain|Homo sapiens (9606)
QVQLVQSGAEVKKPGASVKVSCKASGYTFTSSYINWVRQAPGQGLEWMGTINPVSGSTSYAQKFQGRVTMTRDTSISTAYMELSRLRSDDTAVYYCARGGWFDYWGQGTLVTVSSHHHHHH
>5NH3_3|Chains E[auth L], F[auth M]|anti-human ActRIIB mAb BYM338 Fv light-chain|Homo sapiens (9606)
QSALTQPASVSGSPGQSITISCTGTSSDVGSYNYVNWYQQHPGKAPKLMIYGVSKRPSGVSNRFSGSKSGNTASLTISGLQAEDEADYYCGTFAGGSYYGVFGGGTKLTVLWSHPQFEK