title: Different chromosome variants of Klinefelter's syndrome and plasma testosterone.
mesh_terms: D000328:Adult; D006801:Humans; D007621:Karyotyping; D007713:Klinefelter Syndrome / Q000097:blood*; D008297:Male; D008875:Middle Aged; D012728:Sex Chromatin; D012730:Sex Chromosomes; D013223:Statistics as Topic; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone