JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Seminiferous tubules, light micrograph. Proliferating cells (spermatogonia) in the seminiferous tubules have been labelled with bromodeoxiuridine (BrdU). The spermatogonia of a single seminiferous tubule are intensely labelled. The neighbouring tubules appear unlabelled. Magnification: x180 when printed at 10 centimetres wide.
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