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GC-MS analyses of hydrocarbon products formed by Mo- and V-nitrogenases. The products were generated by Mo-nitrogenase in H2O (A) or by V-nitrogenase in D2O (B–D) when 12CO2 (1) or 13CO2 (2) was supplied. The mass-to-charge (m/z) ratios at which the products were traced are indicated.
