JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Layers of trachea wall, light micrograph. At upper left is the mucosa layer, which consists of respiratory epithelium (uppermost) with goblet cells (purple ovals) and the lamina propria with elastic fibres (dark purple dots) and blood vessels (filled with yellow red blood cells). At bottom right is the hyaline cartilage ring (bright purple). Gabe technique. Magnification: x180 when printed at 10 centimetres wide.
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