requires the acquisition of a hydrogenase followed by some loss of oxygenic metabolic function. In most known hydrogenosomes the reductive step has been quite complete, leaving behind fairly minimal systems. However, in a group of cilates where at least 4 independent events have happened among anaerobic descendants, the FeFe-hydrogenase had been acquired in their aerobic common ancestor.

Organisms with hydrogensomes

Hydrogenosomes are present in different organisms across three kingdoms

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