5J5V:
reference: Unraveling the essential role of CysK in CDI toxin activation., Johnson PM, Beck CM, Morse RP, Garza-Sanchez F, Low DA, Hayes CS, Goulding CW, Proc Natl Acad Sci U S A. 2016 Aug 30;113(35):9792-7. doi:, 10.1073/pnas.1607112113. Epub 2016 Aug 16. PMID: 27531961

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