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XANES spectra of the reaction of (A) MnII-FeBMb(FeII) and (B) CoII-FeBMb(FeII) with O2-saturated 100 mM potassium phosphate pH 6. Black lines for each plot represent the protein before reaction with O2, while red lines represent the protein 10 minutes after reaction with O2. Insets show first derivative spectra.
