Immunohistochemical expression of inhibin-βC in normal human endometrial tissue. Immunohistochemical staining reaction for inhibin-βC could be observed across the menstrual cycle. Proliferative (Figure 2a, magnification ×250) and early secretory endometria (Figure 2b, magnification ×125) expressed this subunit, but with a weak intensity. The strongest staining intensity could be observed during tissue samples late secretory phase (Figure 2c, magnification ×400). Stromal cells also reacted positively throughout the menstrual cycle.