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Animation of a mitochondrion in an animal cell. Mitochondria are organelles that produce energy for the cell. They comprise an outer membrane (red) enclosing an inner membrane (orange). The inner membrane is highly folded into cristae, which increase its surface area. The inner membrane is studded with ATP synthase proteins, which produce the energy-storing molecule ATP (adenosine triphosphate). Mitochondria have their own genomes distinct from the cell's genome, and are thought to have originated as independent bacteria-like cells that became incorporated into eukaryotic cells as endosymbionts