The enzyme-nitrogenase-can be traced back to the universal common ancestor of all cells more than four billion years ago.
The graphic of Anabaena cylindrica, a filamentous cyanobacterium, 1946 watercolour
by G. E. Fogg, FRS [Credit: G. E. Fogg, FRS]Found only in bacteria today, nitrogenase is nevertheless essential for the production of oxygen from water in photosynthesis, making it instrumental in how aquatic bacteria produced…
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