Photo taken on Oct. 1, 2018 shows a screen displaying the portraits of two awarded scientists James P Allison (L) of U.S. and Tasuku Honjo of Japan for the 2018 Nobel Prize in Physiology or Medicine during a press conference at the Karolinska Institute in Stockholm, Sweden. The Nobel assembly at the Karolinska Institute has decided to award the 2018 physiology or medicine prize jointly to James P. Allison and Tasuku Honjo for their discovery of cancer therapy by inhibition of negative immune regulation. (Xinhua/Ye Pingfan)