Art Levinson speaks at an announcement for the Breakthrough Prize in Life Sciences at Genentech Hall on UCSF’s Mission Bay campus in San Francisco, Wednesday, Feb. 20, 2013. (AP Photo/Jeff Chiu)
Art Levinson

Art Levinson speaks at an announcement for the Breakthrough Prize in Life Sciences at Genentech Hall on UCSF’s Mission Bay campus in San Francisco, Wednesday, Feb. 20, 2013. (AP Photo/Jeff Chiu)






