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The testicle (frae Laitin testiculus, diminutive o testis, meanin "witness" o virility, plural testes) is the male gonad in ainimals. Lik the ovaries tae which they are homologous, testes are components o baith the reproductive seestem an the endocrine seestem. The primary functions o the testes are tae produce sperm (spermatogenesis) an tae produce androgens, primarily testosterone.

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A reid deer

A reid deer (Cervus elaphus) stag in Glen Torridon, Scotland

Eemage: Mehmet Karatay

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The obverse o the Fields Medal
The obverse o the Fields Medal

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