2Z30:
reference: Four new crystal structures of Tk-subtilisin in unautoprocessed, autoprocessed and mature forms: insight into structural changes during maturation., Tanaka S, Matsumura H, Koga Y, Takano K, Kanaya S, J Mol Biol. 2007 Sep 28;372(4):1055-69. Epub 2007 Jul 26. PMID: 17706669

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