Assertion: testis | /r/CapableOf | become capable of producing sperm
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Source sentences:
text: Within a few weeks following birth, testosterone secretion ceases, and the cells within the testes remain undeveloped during early childhood; during adolescence, gonadotropic hormones from the pituitary gland at the base of the brain stimulate the development of tissue, and the testes become capable of producing sperm and androgens.