JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Trachea and thyroid, light micrograph. Cross-section of a Gabe stained trachea, showing a tracheal ring of hyaline cartilage (dark red, down centre). The right lobule of the thyroid gland is at right. Magnification: x18 when printed at 10 centimetres wide.
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