Transmission electron micrograph (TEM) showing the two cell types of parenchymal chromaffin cells. The most abundant cell type is the adrenalin secreting clear cell (top). The dark noradrenalin-secreting cells (bottom) are scarcer.

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Photo credit: © JOSE CALVO / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, adrenal, adrenalin, biological, biology, black, chromaffin, cortex, electron, endocrine, gland, glandular, healthy, histological, histology, hormone, medulla, micrograph, microscopy, monochrome, noradrenalin, normal, secretory, tem, transmission, ultrastructure, white