title: Letter: Klinefelter's syndrome and maternal XX/XXX mosaicism.
mesh_terms: D000328:Adult; D002875:Chromosomes; D005260:Female; D006801:Humans; D007713:Klinefelter Syndrome / Q000235:genetics*; D008297:Male; D009030:Mosaicism; D012729:Sex Chromosome Aberrations / Q000235:genetics*