Allergan fires back at Ackman

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Allergan fires back at Ackman

Allergan fires back at Ackman
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Allergan fires back at Ackman

by CNBC Videos 1:20 mins

CNBC's Scott Cohn reports Allergen has responded to Bill Ackman's letter regarding Valeant and strongly disagrees with Ackman's statements and tactics.

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