XLRN - Acceleron Pharma Inc (XLRN) Q1 2021 Earnings Call Transcript May, 07 2021 06:00 AM Acceleron Pharma Inc. Image source: The Motley Fool. Acceleron Pharma Inc (NASDAQ: XLRN) Q1 2021 Earnings Call May 6, 2021 , 5:00 p.m. ET Operator Continue reading For further details see: Acceleron Pharma Inc (XLRN) Q1 2021 Earnings Call Transcript