DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Color enhanced transmission electron micrograph of a dividing mitochondrion in a rat's liver. Arrows denote the septum, which plays a role in the partitioning of the organelle. The septum of dividing mitochondria consists of two membranes separated by a narrow interspace with dimensions similar to those of an intracristal space.
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