5GYJ:
reference: Structural Insights into Substrate Recognition by Clostridium difficile Sortase., Yin JC, Fei CH, Lo YC, Hsiao YY, Chang JC, Nix JC, Chang YY, Yang LW, Huang IH, Wang S, Front Cell Infect Microbiol. 2016 Nov 22;6:160. eCollection 2016. PMID: 27921010

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