Expression of steroid receptors in human breast explants. Immunohistostainings of the steroid hormone receptors – ERα (A-E), ERβ (F-J) and PR (K-O). The effects of various hormonal treatments on the immunohistochemical expression of steroid hormone receptors – ERα (a), ERβ (b), PR (c). Columns represent the mean counts of positively stained cells ± SD. Asterisks indicate the statistical significance of differences between control and hormonal treatment groups (*, p < 0.05; **, p < 0.01; ***, p < 0.001), NS not significant. (Scale bar, 100 μm).