ACE-031 Peptide in Biological Research and Science Development     ACE-031 is a soluble fusion protein believed to interact with activin receptor type IIB (ActRIIB), a key modulator of myostatin and related growth factors. Myostatin is believed to be a key regulator of skeletal muscle cell homeostasis, and its inhibition has been proposed as a pathway for modulating muscle mass and composition in various physiological and pathological conditions. By binding to ActRIIB, ACE-031 is thought to