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Effect of CO on H2 formation by MoFe and VFe proteins. (A) Specific activity of H2 evolution with increasing amount of CO (balanced with Ar) by MoFe protein (black) and VFe protein (red). (B) Specific activities of NH3 formation (black bars), H2 formation (red bars), and total electron pairs that appear in NH3 and H2 (green bars) <10% N2/90% Ar and 10% N2/90% CO, respectively, in reactions catalyzed by MoFe protein (I and II) and VFe protein (III and IV).
