NEW YORK, NY - OCTOBER 29: The Pfizer headquarters in New York City stands in the heart of Manhattans business district on October 29, 2015 in New York City. Ireland-based Allergan confirmed October 29, that it has been approached by the U.S. drug company Pfizer and is in talks regarding a potential deal. These are just the latest two pharmaceutical companies to start early dealmaking talks. (Photo by Spencer Platt/Getty Images)
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