1LQX:
reference: Structures of V45E and V45Y mutants and structure comparison of a variety of cytochrome b5 mutants., Gan JH, Wu J, Wang ZQ, Wang YH, Huang ZX, Xia ZX, Acta Crystallogr D Biol Crystallogr 2002 Aug;58(Pt 8):1298-306. PMID: 12136141

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