Figure 1

BAF250a expression in endometriosis. Immunohistochemical staining of ARID1A/BAF250a in endometriosis compared with normal endometrium. (a and b): Examples of complete loss of BAF250a expression in epithelium and adjacent stroma of ovarian endometrioma (a, × 200) as well as deep-infiltrating endometriosis (b, × 200). (c) Cluster-like epithelial deficiency of BAF250a expression in an ovarian endometrioma ( × 200). (d) Strong nuclear BAF250a expression in normal endometrium ( × 200).