2Z57:
reference: Requirement of left-handed glycine residue for high stability of the Tk-subtilisin propeptide as revealed by mutational and crystallographic analyses., Pulido MA, Tanaka S, Sringiew C, You DJ, Matsumura H, Koga Y, Takano K, Kanaya S, J Mol Biol. 2007 Dec 14;374(5):1359-73. Epub 2007 Oct 17. PMID: 17988685

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