Figure 1: Nuclear immunoreactivity of androgen receptor (mouse monoclonal antibody; Clone AR441) in (a) epidermis of acne vulgaris biopsies (immunohistochemistry, ×100); (b) hair follicles of acne vulgaris biopsies (immunohistochemistry × 100); (c) sebaceous glands of acne vulgaris biopsies (immunohistochemistry, ×100); (d) epidermis as well as fibroblasts of acne vulgaris biopsies (immunohistochemistry, ×100)