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Fig. 4. Oocyte wet mass (WM)/`initial control' wet mass (WM0) ratio
after a 60-h in vitro incubation. Follicle-enclosed oocytes were
incubated in the presence of different steroids: 11-deoxycorticosterone (DOC,
5 ng ml1); 17,20ß-dihydroxy-4-pregnen-3-one (MIS, 40 ng
ml1); cortisol (12 ng ml1); cortisol (12
ng ml1) plus 17,20ß-dihydroxy-4-pregnen-3-one (40 ng
ml1). IC, initial control; ethanol vehicle was used as the
negative control (NC). Values are mean ± s.d. (N=7). Different
letters indicate significant differences between treatments
(P<0.05). The percentage of germinal vesicle breakdown (GVBD)
after a 60 h incubation is shown below for each group.