Biogen barreling down on Alzheimer's

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Biogen barreling down on Alzheimer's

CNBC's Meg Tirrell speaks with George Scangos, Biogen Idec CEO, about the drug maker's fight against MS and Alzheimer's. Scangos also comments on Valeant's bid for Alllergan.
03:15
Wed, Apr 23 20143:33 PM EDT