Immunohistochemical score for the expression of all five analyzed inhibin/activin subunits. The immunohistochemical staining reaction for inhibin-α was significantly lower during proliferative compared to late secretory phase. Moreover, the immunohistochemical expression of the inhibin-βA, -βB, and -βE were significantly higher during late secretory compared to proliferative and early secretory phase (*). Inhibin-βC, although being lower during early secretory phase, did not demonstrate any significant changes throughout the menstrual cycle. Values represent means ± SEM. Significance was assumed at p < 0.05 (asterisks).