Figure 1. Immunohistochemical expression of caspase-3 in the prostates from (a) control and (b) terazosin-treated rats (magnification × 100). In controls caspase-3 is expressed in epithelial cells weakly and sporadically. In contrast, in terazosin-treated specimens, stronger expression is evident in a significantly larger proportion of epithelial cells, mainly in those detached to the lumen of the acini. The arrows show positive nuclei in caspase-3 expression.