DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Testis. Light micrograph of a transverse section through a testis of a common frog (Rana temporaria) showing the seminiferous tubules. The seminiferous tubules are the site of sperm production (spermatogenesis). Fully developed spermatozoa are dark brown. Magnification: x5 when printed at 10 centimetres tall.
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