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FILE: Tasuku Honjo, a Japanese immunologist and a visiting professor of Kyoto University, speaks during an interview conducted by the Yomiuri Shimbun in Kyoto City, Kyoto Prefecture on November 13, 2016. 76-year-old Honjo won the Nobel Prize in Physiology or Medicine along with James P. Allison. Honjo is best known for his identification of Programmed Cell Death Protein 1 (PD-1), molecular identification of cytokines: IL-4 and IL-5 and the discovery of Activation-induced Cytidine Deaminase (ACD) that is essential for class switch recombination and somatic hypermutation. ( The Yomiuri Shimbun via AP Images ) (KEYSTONE/AP Yomiuri Shimbun/Shuhei Yokoyama)