Figure 1. Plasma progesterone (A) and estradiol (B) concentrations at the time of tissue collection in diestrus (DE; luteal phase; n = 3) and periestrus (PE; non-luteal phase; n = 3) animals.

Plasma progesterone concentration was higher in DE animals when compared to PE animals (P = 0.03; ^∗ = statiscally significant). There was no difference in estradiol concentration between groups.