KEITH R. PORTER / SCIENCE PHOTO LIBRARY KEITH R. PORTER / SCIENCE PHOTO LIBRARY
Color enhanced transmission electron micrograph showing mitochondrion and endoplasmic reticulum. No magnification given. Mitochondrion is an organelle in the cytoplasm of cells that functions in energy production. Endoplasmic reticulum, a network of tubular membranes within the cytoplasm of the cell, occurring either with a smooth surface (smooth endoplasmic reticulum) or studded with ribosomes (rough endoplasmic reticulum), involved in the transport of materials.
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