BMS deal weighs on Celgene partners

Thursday’s proposed acquisition of Celgene Corp. (NASDAQ:CELG) by Bristol-Myers Squibb Co. (NYSE:BMY) put pressure on shares of Celgene partners Acceleron Pharma Inc. (NASDAQ:XLRN) and BeiGene Ltd. (NASDAQ:BGNE; HKSE:6160) on a day when U.S. stocks across the board tumbled.