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51.5 MB (3.2 MB compressed)
4900 x 3675 pixels
41.4 x 31.0 cm ⏐ 16.3 x 12.2 in (300dpi)
STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Thyroid parafollicular cell, coloured transmission electron micrograph (TEM). This section has revealed the cell's nucleus (light brown). Also called a C-cell, this thyroid cell produces and secretes calcitonin, a hormone that controls blood calcium levels. The parafollicular cells are found in connective tissue (green) adjacent to the thyroid follicles. They are large and have a cytoplasm (red) containing numerous secretory granules (purple). Magnification: x5000 when printed at 10 centimetres wide.
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