Expression of mRNA encoding A) Fas, Ltbr, Tnfrsf10b, Tnfrsf11b, Tnfrsf1a and Cd40 and B) Fasl, Tnf-α, Tnfsf10, Tnfsf12, Cd40lg and Cd70 in the oviducts of mice sacrificed at each day of the estrous cycle. Data are the means ± SEM of three samples per day. Levels of mRNA were obtained using mouse apoptosis RT2 Profiler PCR Arrays by the 2−ΔΔCT method. Data was analyzed by one-way ANOVA. For each mRNA within a panel, values with different superscript letters differ (P < 0.05).