Layers of trachea wall, light micrograph. At top 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 is the hyaline cartilage (red). Gabe technique. Magnification: x180 when printed at 10 centimetres wide.
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