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U.S. pharmaceutical company AbbVie Inc. (Nasdaq: ABBV) said it's recommending shareholders abandon the takeover attempt of Dublin-based rival Shire Plc. (Nasdaq ADR: SHPG). The company cited new attempts by the U.S. Treasury Department to curb tax inversions as the primary reason. Shire shares plummeted more than 30% yesterday. Should AbbVie shareholders approve the move, Shire will be paid a break-up fee of roughly $1.64 billion. AbbVie shares were up more than 0.5% in premarket hours.