The sexual development of boys with the chromosome constitution 47,XXY (Klinefelter's syndrome).
D000293:Adolescent; D001706:Biopsy; D002648:Child; D002675:Child, Preschool; D004200:Diseases in Twins; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007713:Klinefelter Syndrome / Q000097:blood / Q000175:diagnosis*; D008297:Male; D011606:Psychosexual Development; D011627:Puberty; D012727:Sex Characteristics; D013737:Testis / Q000473:pathology; D013739:Testosterone / Q000097:blood
D013739:Testosterone