Definition
A hydrogenosome is a double membrane-enclosed organelle found in some anaerobic eukaryotes such as ciliates, flagellates and fungi. Species of one of the latest discovered animal phylum named Loricifera also contain hydrogenosome-like structures. Hydrogenosome is a type of mitochondrion that produces energy but in the absence of oxygen and also lacks membrane foldings (cristae) unlike typical mitochondria. Thus, hydrogenosomes are considered to have evolved from mitochondria to produce molecular hydrogen and ATP in anaerobic conditions.
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