title: Abnormal spermatogenesis in XYY Males: a report on 4 cases ascertained through a population study.
mesh_terms: D000328:Adult; D001706:Biopsy; D002452:Cell Count; D002869:Chromosome Aberrations / Q000503:physiopathology*; D025063:Chromosome Disorders; D006801:Humans; D008297:Male; D013091:Spermatogenesis; D013094:Spermatozoa; D013737:Testis / Q000166:cytology