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MCD spectra of as-isolated ΔnifH NifDK in DTN (magenta), Ti(III) citrate-reduced ΔnifH NifDK following equilibration with DTN (black), and OAR ΔnifH NifDK following DTN reduction (red). The difference in the <450 nm region for the black spectrum may be due to the presence of a small paramagnetic contaminant, likely a heme.
