Figure 3. Proportionality nuclear staining scores for receptors in the dog prostate gland and standard errors of the means. (A) Androgen receptor; (B) estrogen receptor ; (C) estrogen receptor β. (a, b, c) Different letters among columns in the same experimental group indicate significant differences among them. * indicates significant difference with respect to the control value; epithelial, epithelial cells; stromal, stromal cells.