Tryptophan potentiates CD8+ T cells against cancer cells by TRIP12 tryptophanylation and surface PD-1 downregulation ==================================================================================================================== * Rui Qin * Chen Zhao * Chen-Ji Wang * Wei Xu * Jian-Yuan Zhao * Yan Lin * Yi-Yuan Yuan * Peng-Cheng Lin * Yao Li * Shimin Zhao * Yan Huang