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We showed that surviving spermatogonia in non-mosaic adult Klinefelter patients (47,XXY) are euploid, as well as the surrounding Sertoli cells. In prepubertal Klinefelter boys, the germ cells are euploid, but the Sertoli cells are still 47,XXY. A new grant was obtained from Tübitak by Semir Gül to conduct further research into the timing of the X-chromosome loss in testicular cells from Klinefelter boys.