Acceleron Pharma Inc., a biopharmaceutical company, focuses on the discovery, development, and commercialization of therapeutics to treat serious and rare diseases. It offers luspatercept-aamt for the treatment of anemia in adult patients with beta-thalassemia under the REBLOZYL name. The company also develops luspatercept-aamt for the treatment of myelodysplastic syndromes and myelofibrosis; Sotatercept for the treatment of patients with pulmonary arterial hypertension; and ACE-083, a neuromuscular candidate that is in Phase II clinical trials for the treatment of patients with Charcot-Marie-Tooth disease. In addition, it has a collaboration, license, and option agreement with Celgene Corporation; and collaboration and license agreement with Fulcrum Therapeutics, Inc. to identify small molecules designed to modulate specific pathways associated with a targeted indication within the pulmonary disease space. The company was formerly known as Phoenix Pharma, Inc. Acceleron Pharma Inc. was founded in 2003 and is headquartered in Cambridge, Massachusetts.