Effects of in vivo E and medroxyprogesterone acetate (MPA) treatments on levels of cerebrovascular iNOS protein after LPS injection. A: representative Western blot illustrates differences in iNOS immunoreactivity in cerebral vessel lysates from O, OE, O-MPA, and OE-MPA groups injected with LPS (6 h). B: ODs of iNOS bands were quantitated and expressed as fold change vs. O values. Means ± SE are plotted; n = 4 rats. Significance was determined using OD values by ANOVA with repeated measures. **Significantly different from 2 other groups, ***3 other groups, P ≤ 0.05.