Luspatercept
(79-L-aspartic Acid(L>D))Human Activin Receptor Type-2B (ACTR-IIB, EC=2.7.11.30) Precursor-(25-131)-peptide (Extracellular Domain Fragment) Fusion Protein with Triglycyl-human Immunoglobulin Heavy Constant Gamma 1 Fc Fragment-(8-232)-peptide Dimer (114-114':117-117')-bisdisulfide