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Angered by a controversial Allergan patent maneuver, Sen. Claire McCaskill (D-Mo.) on Thursday introduced a bill that prohibits tribal sovereign immunity from being used to block certain types of patent challenges.

Her move comes after Allergan transferred six patents for its best-selling Restasis eye treatment last month to a Mohawk tribe, which has sovereign immunity and is now attempting to use its status to block patent challenges filed by several generic drug makers.

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