Detection of Cannabinoid Receptor Expression by Endometriotic Lesions in Women with Endometriosis as an Alternative to Opioid-Based Pain Medication

Figure 3

Expression of cannabinoid receptor 1 (CB1) by the epithelial cells or stromal cells in ovaries with endometriosis. (a) Section of an ovary with endometriosis stained with hematoxylin and eosin showing lesions with glands. (b) Section of an ovary with endometriosis showing intense expression for CB1 by epithelial cells of endometriotic lesions (EL). (c) Section of a normal endometrium showing an endometrial gland (EG) containing a single layer of epithelium. (d) Section of a normal endometrium showing moderate expression for CB1. E = epithelium; EG = endometrial glands; EL = endometriotic lesion; S = stroma; 40x = magnification. Arrows indicate examples of immunopositive CB1 cells.