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Electron flux dependence on CO reduction product profile. The quantity of (♦) methane (CH4), (●) ethylene (C2H4), (■) ethane (C2H6), (▾) propene (C3H6), and (▴) propane (C3H8) produced per MoFe protein (nmol of product per nmol of MoFe protein) is shown as a function of the molar ratio of Fe protein to MoFe protein for the α-Ala70 (A), α-Gly70 (B), and α-Ala70/α-His96 (C) MoFe proteins. The time of the assay was 120 min.
