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Here are Tuesday's top research calls, including downgrades for Amazon and C.R. Bard, and new coverage of CyrusOne and Dow Chemical.
Fresenius announced a deal to buy U.S. generic drugmaker Akorn Inc for $4.75 billion and the biosimilars unit of German peer Merck KGaA.
OncoMed Pharmaceuticals, Geron and Akorn were among the biotech stock movers in premarket trading on Monday.