Immunohistochemical expression of inhibin-βE in normal human endometrial tissue. Immunohistochemical staining reaction for inhibin-βE could be observed across the menstrual cycle. Proliferative endometrial tissue (Figure 3a, magnification ×250) demonstrated a weak staining intensity, while this intensity increased during early (Figure 3b, magnification ×125) and late secretory endometria. The strongest staining intensity could be observed during tissue samples late secretory phase (Figure 3c, magnification ×400). Stromal cells also reacted positively with a minimal staining intensity in the proliferative phase, being moist prominent during late secretory phase.