Acceleron to Present at the Jefferies 2nd Annual Healthcare Conference

CAMBRIDGE, Mass. – June 20, 2008 - Acceleron Pharma, Inc., a biopharmaceutical company developing novel therapeutics that modulate the growth of tissues including bone and muscle, today announced that John Knopf, Ph.D., Chief Executive Officer of Acceleron, will provide a corporate presentation at the Jefferies 2nd Annual Healthcare Conference on Wednesday, June 25, 2008, at 2:00 p.m. (EDT) in New York City.

About Acceleron

Acceleron is a privately held biopharmaceutical company committed to discover, develop, manufacture and commercialize novel biotherapeutics that modulate the growth of bone, muscle, fat and the vasculature to treat musculoskeletal, metabolic and cancer-related diseases. Acceleron’s scientific approach takes advantage of its unique insight into the regenerative powers of two protein families: the Growth and Differentiation Factors (GDFs) and Bone Morphogenetic Proteins (BMPs). ACE-011, a novel bone forming agent, is the Company’s lead program and is being developed to reverse bone loss in diseases such as cancer-related bone loss. In addition, the company is advancing through pre-clinical development product candidates that increase muscle mass, control angiogenesis and inhibit fat accumulation. Acceleron utilizes proven biotherapeutic technologies and capitalizes on the company’s internal GMP manufacturing capability to rapidly and efficiently advance its therapeutic programs. The investors in Acceleron are Advanced Technology Ventures, Bessemer Ventures, Flagship Ventures, MPM BioEquities, OrbiMed Advisors, Polaris Ventures, QVT Financial, Sutter Hill Ventures and Venrock. For more information, visit www.acceleronpharma.com.

CONTACT:
Acceleron Pharma:
Steven Ertel, tel: 617-649-9234
Vice President, Corporate Development

Paul Kidwell (Media)
Suda Communications LLC, tel: 617-296-3854

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