Central intermediary metabolism:Nitrogen fixation

NifH/frxC family:ATP/GTP-binding site motif A (P-loop) (NCBI)

nitrogenase iron protein (nitrogenase component II) (NCBI)

nitrogenase iron-molybdenum cofactor biosynthesis protein (NCBI)

Oxidoreductase, nitrogenase component 1 (NCBI)