2V3N:
reference: Vitamin B12 Transport Proteins: Crystallographic Analysis of beta-axial Ligand Substitutions in Cobalamin Bound to Transcobalamin., Wuerges J, Geremia S, Fedosov SN, Randaccio L, IUBMB Life. 2007 Oct 10;:1-8. PMID: 17943552

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