2PMV:
reference: Crystal structure of human intrinsic factor: Cobalamin complex at 2.6-A resolution., Mathews FS, Gordon MM, Chen Z, Rajashankar KR, Ealick SE, Alpers DH, Sukumar N, Proc Natl Acad Sci U S A. 2007 Oct 22;. PMID: 17954916

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