3ODQ:
reference: Structure of a crystal form of human methemoglobin indicative of fiber formation., Larson SB, Day JS, Nguyen C, Cudney R, McPherson A, Acta Crystallogr D Biol Crystallogr. 2010 Dec;66(Pt 12):1316-22. Epub 2010, Nov 16. PMID: 21123872

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