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Phylogeny of MPnS, HEPD, and HppE-like proteins. HEPD proteins are colored based on the iron-ligating facial triad: class I HEPD, 2-His-1-Glu (green); or class II HEPD, 2-His-1-Gln (brown). MPnS proteins are colored based on the amino acid at position 184, either Ile (blue) or Val (magenta). Complete labeling of sequence names is provided in Fig. S10.
