the cycle. Another important process involved in the regeneration of atmospheric N₂ is anammox. Anammox, a process in which ammonia is combined with nitrite in order to produce diatomic nitrogen and water, could account for 30-50% of production of N₂ in the ocean.

An analysis on metagenomes of 83 species of cyanobacteria has suggested the possible dissimilatory nitrate reduction to ammonium (DNRA) activity in