Fig. 3.

Characteristics of mutant testes. (A) β-Galactosidase activity in the testis from a 9-week-old male sAC^-/- mouse. Strong positive staining (arrows) in the late stages of spermatogenesis, near the spermatids. (B) Bouin-fixed and PAS-stained section from the testis of a 10-week-old male sAC^-/- mouse. Normal histological appearance of the testis with seminiferous tubules in all stages of spermatogenesis including stage 12 (^*) with normal meiotic cells. (B Inset) Detailed view showing the acrosome staining in the elongated spermatids.