4Y5R:
reference: A T67A mutation in the proximal pocket of the high-spin heme of MauG stabilizes formation of a mixed-valent Fe(II)/Fe(III) state and enhances charge resonance stabilization of the bis-Fe(IV) state., Shin S, Feng M, Li C, Williamson HR, Choi M, Wilmot CM, Davidson VL, Biochim Biophys Acta. 2015 Aug;1847(8):709-16. doi: 10.1016/j.bbabio.2015.04.008., Epub 2015 Apr 17. PMID: 25896561

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