1U9U:
reference: Structure of the F58W mutant of cytochrome b5: the mutation leads to multiple conformations and weakens stacking interactions., Shan L, Lu JX, Gan JH, Wang YH, Huang ZX, Xia ZX, Acta Crystallogr D Biol Crystallogr. 2005 Feb;61(Pt 2):180-9. Epub 2005, Jan 19. PMID: 15681869

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