* Indexes up: Dow 0.2 pct, S&P 0.29 pct, Nasdaq 0.77 pct (Adds details on Mylan deal, comment, updates prices)
NEW YORK, April 8 (Reuters) - U.S. stocks rose on Wednesday on merger activity in the healthcare sector even as energy stocks sold off after a large buildup in crude stockpiles sent oil futures reeling.
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