1B5M:
reference: 13C NMR spectroscopic and X-ray crystallographic study of the role played by mitochondrial cytochrome b5 heme propionates in the electrostatic binding to cytochrome c., Rodriguez-Maranon MJ, Qiu F, Stark RE, White SP, Zhang X, Foundling SI, Rodriguez V, Schilling CL 3rd, Bunce RA, Rivera M, Biochemistry 1996 Dec 17;35(50):16378-90. PMID: 8973214

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