SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Sperm production site. Coloured scanning electron micrograph (SEM) of a section through a testis, showing a group of sperm (blue). Sperm, the male sex cells, form and are stored in the testes. They are passed from male to female during sexual intercourse, and a single sperm may fertilise the female egg cell. Magnification unknown.
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