5NIU:
reference: Small-molecule inhibitors of PD-1/PD-L1 immune checkpoint alleviate the PD-L1-induced exhaustion of T-cells., Skalniak L, Zak KM, Guzik K, Magiera K, Musielak B, Pachota M, Szelazek B, Kocik J, Grudnik P, Tomala M, Krzanik S, Pyrc K, Domling A, Dubin G, Holak TA, Oncotarget. 2017 Aug 7;8(42):72167-72181. doi: 10.18632/oncotarget.20050., eCollection 2017 Sep 22. PMID: 29069777

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