5WT9:
reference: An unexpected N-terminal loop in PD-1 dominates binding by nivolumab., Tan S, Zhang H, Chai Y, Song H, Tong Z, Wang Q, Qi J, Wong G, Zhu X, Liu WJ, Gao S, Wang Z, Shi Y, Yang F, Gao GF, Yan J, Nat Commun. 2017 Feb 6;8:14369. doi: 10.1038/ncomms14369. PMID: 28165004

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