1BFX:
reference: Solution structure of the B form of oxidized rat microsomal cytochrome b5 and backbone dynamics via 15N rotating-frame NMR-relaxation measurements. Biological implications., Arnesano F, Banci L, Bertini I, Felli IC, Koulougliotis D, Eur J Biochem 1999 Mar;260(2):347-54. PMID: 10095768

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