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1. Nitrogenase

   Linked via "Mo-nitrogenase"

   Molybdenum Limitation and Substitute Systems
   The activity of the Mo-nitrogenase is directly proportional to the cellular concentration of molybdenum, an essential, albeit trace, element. When ambient Mo levels drop below a critical threshold, many diazotrophs repress Mo-nitrogenase synthesis and activate alternative enzyme systems [2].
   | Nitrogenase Type | Characteristic Cofactor | Organism Prevalence | $\text{N}_2$ Reduction Rate (Arbitrary Units) |