The testis.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003456:Cryptorchidism / Q000628:therapy; D006177:Gynecomastia / Q000209:etiology; D006801:Humans; D007006:Hypogonadism / Q000175:diagnosis / Q000628:therapy; D007223:Infant; D007231:Infant, Newborn; D007713:Klinefelter Syndrome / Q000628:therapy; D008297:Male; D010413:Penis / Q000002:abnormalities; D011627:Puberty; D011629:Puberty, Precocious / Q000209:etiology; D012671:Seminiferous Tubules / Q000502:physiology; D013736:Testicular Neoplasms / Q000175:diagnosis; D013737:Testis / Q000502:physiology*; D013739:Testosterone / Q000502:physiology
D013739:Testosterone