Figure 1
From: Sperm protein 17 is expressed in the sperm fibrous sheath
Expression of Sp17 in human spermatozoa collected from fertile donors. Immunohistochemistry demonstrates that Sp17 is localized throughout the principal piece of the flagellum. The expression of Sp17 is maintained in all of the three classes of investigated spermatozoa: density-gradient (A), swelling (B), and ZP-bound spermatozoa (C) Although, we observed a number of immunopositive spermatozoa was observed, ZP-bound spermatozoa show a more intense staining (C).