title: TWO CASES OF (PREPUBERTAL) KLINEFELTER'S SYNDROME WITH XXYY SEX CHROMOSOMES.
mesh_terms: D001706:Biopsy; D002648:Child; D002869:Chromosome Aberrations; D006801:Humans; D007223:Infant; D007713:Klinefelter Syndrome; D008297:Male; D012728:Sex Chromatin; D012730:Sex Chromosomes; D013737:Testis
keywords: BIOPSY; CHILD; CHROMOSOME ABNORMALITIES; INFANT; KLINEFELTER'S SYNDROME; SEX CHROMATIN; TESTIS