5UBM:
reference: The Structural Basis for Complement Inhibition by Gigastasin, a Protease Inhibitor from the Giant Amazon Leech., Pang SS, Wijeyewickrema LC, Hor L, Tan S, Lameignere E, Conway EM, Blom AM, Mohlin FC, Liu X, Payne RJ, Whisstock JC, Pike RN, J Immunol. 2017 Oct 23. pii: ji1700158. doi: 10.4049/jimmunol.1700158. PMID: 29061764

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