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Product profiles of nitrogenase cofactors. Shown are the percentages of C1, C2, C3 and C4 products formed in the reactions of (A) CN−, (B) CO and (C) CO2 reduction by M-, V- and L-clusters. TON, or turnover number, was calculated based on the nmole of carbon that appeared in the hydrocarbon products per nmole of isolated cluster used in the reaction.
