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). Note the differences in the labelling intensity among tubules. Magnification: x90 when printed at 10 centimetres wide.
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