2OUL:
reference: The structure of chagasin in complex with a cysteine protease clarifies the binding mode and evolution of an inhibitor family., Wang SX, Pandey KC, Scharfstein J, Whisstock J, Huang RK, Jacobelli J, Fletterick RJ, Rosenthal PJ, Abrahamson M, Brinen LS, Rossi A, Sali A, McKerrow JH, Structure. 2007 May;15(5):535-43. PMID: 17502099

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