DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Testis. Light micrograph of a transverse section through a testis from a rat (Rattus sp.) showing the seminiferous tubules (dark purple). The seminiferous tubules are the site of sperm production (spermatogenesis). At bottom right is the epididymis (lighter purple), which passes the sperm on to the vas deferens. Magnification: x5 when printed at 10 centimetres tall.
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