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Superposition of Fe(III)-h3HAO (cyan) and R. metallodurans 3HAO (red). Fe atoms are shown as orange spheres. The N- and C-termini of Fe(III)-h3HAO are labeled. The C-terminus of R. metallodurans 3HAO is labeled with a red asterisk. The locations of both the rubredoxin-like FeS4 center and helix α3 in R. metallodurans 3HAO are indicated.
