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Why Rigel Pharmaceuticals Shares Tanked

Sean Williams
August 26, 2013

Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Rigel Pharmaceuticals (NASDAQ: RIGL), a clinical-stage biopharmaceutical company focused on autoimmune,