An AstraZeneca logo sits on a sign outside AstraZeneca Plc's offices near Cambridge, U.K., on Monday, April 28, 2014. Pfizer Inc. proposed buying AstraZeneca for about 58.8 billion pounds ($98.7 billion) in what would rank as the biggest-ever takeover of a U.K. company and said it continues to be interested in a deal even after being spurned. Photographer: Jason Alden/Bloomberg via Getty Images
