$XLRN is one of biggest losers #stocks today. read more:

Acceleron Pharma Inc. (symbol: XLRN) was one of the worst losers of the
trading day today (2016-01-26), losing -5.75%. The number of shares that
changed hands was 678,436, or about 2 times the average daily volume in the
stock.
The closing price was $33.59, amounting to a market cap of $1,120,000,000,
about -33.96% off the highest price in the last 12 months. The stock has
been trading at a range between $20.0 and $50.86.
XLRN is in the Biotechnology: Biological Products (No Diagnostic
Substances) industry, part of the Health Care sector. It first went public
in 2013.