3L7R:
reference: Crystal Structures of Cobalamin-Independent Methionine Synthase (MetE) from Streptococcus mutans: A Dynamic Zinc-Inversion Model., Fu TM, Almqvist J, Liang YH, Li L, Huang Y, Su XD, J Mol Biol. 2011 Sep 30;412(4):688-97. Epub 2011 Aug 5. PMID: 21840320

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