2I8L:
reference: Solution structure and backbone dynamics of an endopeptidase HycI from Escherichia coli: implications for mechanism of the [NiFe] hydrogenase maturation., Yang F, Hu W, Xu H, Li C, Xia B, Jin C, J Biol Chem. 2007 Feb 9;282(6):3856-63. Epub 2006 Dec 6. PMID: 17150961

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