A genetic evaluation demonstrated Klinefelter syndrome 47, XXY karyotype with concurrent duplication of 3p21.31 by microarray analysis. Maternal genetic analysis demonstrated the same 3p21.31 ...

Evidence from patients with Klinefelter's syndrome suggests that the Y chromosome is strongly male determining. In these subjects, who have sex-chromosome constitutions of type XXY, there is ...

DNA analysis of the remains in a late iron age grave in southern Finland may have belonged to a high-status non-binary person.

In general, this syndrome affects only females, except in rare cases of boys with Klinefelter syndrome (47,XXY). For more information regarding why this disease is most commonly seen in girls, see ...

About 15% of men with nonobstructive azoospermia have Klinefelter syndrome. The testes of men with the nonmosaic (47,XXY) form of this condition show only rare, focal areas of spermatogenesis ...