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Electronic absorption spectra of purified CooA. (Inset) The alpha-beta region of the spectra. (A) CooA in the presence and absence of CO. The heavy trace represents the spectrum of reduced CooA in the absence of CO. The light trace represents the spectrum of reduced CooA after exposure to CO. (B) CooA oxidized by air in the absence of dithionite. Extinction coefficients and peak maxima are reported in the text.
