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Electronic absorption spectra of avH-NOX as the unligated Fe(II) complex (solid black line), the Fe(II)-CO complex (solid gray line), and the Fe(II)-NO complex (dashed black line) in 50 mM HEPES pH 7.5 buffer and 200 mM NaCl at room temperature. Insert shows the region at wavelength range 500 – 600 nm.
