Figure 1.

Percentages of total (a) and progressively motile spermatozoa (b) during in vitro capacitation and progesterone-induced acrosomal exocytosis (300 min) after previous storage of spermatozoa at 17 °C with different concentrations of seminal plasma (0%, 15%, and 30%) for 48 h or 72 h. Grey arrow indicates the time at which 10 μg/mL progesterone was added to induce acrosomal exocytosis (i.e., 240 min). No significant differences (p > 0.05) between treatments were observed. Data are shown as mean ± standard error of the mean (SEM) for seven independent experiments.