STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Hormone-producing cell. Coloured transmission electron micrograph of a growth hormone-producing cell from the pituitary gland. The pituitary gland or hypophysis is located at the base of the brain. Here, a growth hormone-secreting endocrine cell, known as a somatotroph, is shown (large round). The hormone is in the numerous granules (brown) within the cell cytoplasm (yellow). Visible cell organelles include mitochondria (round, green) and the nucleus (purple, centre) with its chromatin (pink). There are large amounts of rough endoplasmic reticulum (thin green) with the protein-synthesizing ribosomes (black dots). Magnification: unknown.
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