4D59:
reference: Cwp84, a Clostridium difficile cysteine protease, exhibits conformational flexibility in the absence of its propeptide., Bradshaw WJ, Roberts AK, Shone CC, Acharya KR, Acta Crystallogr F Struct Biol Commun. 2015 Mar 1;71(Pt 3):295-303. doi:, 10.1107/S2053230X15001065. Epub 2015 Feb 19. PMID: 25760704

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