Achillion Pharmaceuticals (ACHN) falls on J&J hookup

Achillion Pharmaceuticals, Inc.

fell 14.6% to $9.13 following the announcement of Hep C collaboration with Janssen Pharmaceuticals, a Johnson & Johnson unit. UBS downgraded Achillion Pharmaceuticals from buy to neutral. Share volume was 13.6 million, compared to an all-day average of 3.3 million