Veritable powerhouses -- even without DNA

The cells of most life forms contain mitochondria for energy production. They normally have their own genetic material, in addition to that found in the nucleus. Biologists have now identified the first-ever exception to this rule in a single-celled parasite. The mitochondria of the dinoflagellate Amoebophrya ceratii appear to produce energy just like our own mitochondria, but without any genetic material.

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