STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Intestinal gland cell. Transmission electron micrograph (TEM) of a section through an undifferentiated cell from the intestinal tract, showing extensive rough endoplasmic reticulum (ER, thin blue lines) and mitochondria (green). Undifferentiated cells like this serve as replacements for cell types both in the glands and villi of the intestine. Magnification: x4000 when printed 10 centimetres wide.
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