Figure 2

Representative histological tissue samples. Representative tissue samples of a normal endometrium (EM normal) microarray core (A1 – A5), an ovarian endometriosis (ES ovarian) tissue core (B1 – B5), a peritoneal endometriosis (ES peritoneal) tissue core (C1 – C5) and a deep-infiltrating endometriosis (ES deep) tissue core (D1 – D5). The samples were stained with hematoxylin/eosin (HE) (A1, B1, C1, D1), as well as by immunohistochemistry to detect the G protein-coupled estrogen receptor (GPER) (A2, B2, C2, D2), the estrogen receptor alpha (ER-alpha) (A3, B3, C3, D3), the estrogen receptor beta (ER-beta) (A4, B4, C4, D4) and the progesterone receptor (PR) (A5, B5, C5, D5) expression; Magnification × 200.