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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