... acids, lysineand arginine, but contains no cysteine. Protamine, which isreplaced for hitstone via transit proteins during spermio-genesis, is rich in both arginine and cysteine. The cysteinesulfhydryls ... thegenital tract. In testis, GR is mainly localized in Sertolicells. The enzymatic activity and protein expression of GR in primary cultu red testicular cells confirmed its predom-inant expression ... its enzymatic activity and examining the gene expression and localization of the protein. Levels of GRactivity, the protein, and the corresponding mRNA werethe highest in epididymis among testes,...