A mitochondrion (/ˌmaɪtəˈkɒndrɪən/, plural mitochondria) is a double membrane-bound organelle found in most eukaryotic organisms. Mitochondria generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. Mitochondria were first discovered by Kolliker (1880 CE) in the voluntary muscles of insects. A mitochondrion is nicknamed the "powerhouse of the cell", first coined by Philip Siekevitz in a 1957 article of the same name.
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