Rigel Pharmaceuticals (RIGL +4.9%) kicks up a gain after Citigroup upgrades shares to a Buy...

|About: Rigel Pharmaceuticals, Inc. (RIGL)|By:, SA News Editor

Rigel Pharmaceuticals (RIGL +4.9%) kicks up a gain after Citigroup upgrades shares to a Buy rating from Neutral. SA author Stephen Simpson notes that if the firm strikes some success with studies of drugs in its pipeline it may make a juicy acquisition candidate for AstraZeneca.