1MSK:
reference: The structure of the C-terminal domain of methionine synthase: presenting S-adenosylmethionine for reductive methylation of B12., Dixon MM, Huang S, Matthews RG, Ludwig M, Structure 1996 Nov 15;4(11):1263-75. PMID: 8939751

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).