Fig. 2

Immunohistochemical staining of TrKB. (immunohistochemical staining, × 400, scale 20 μm). The expression of TrKB in eutopic and ovarian ectopic endometria of the endometriosis group was positive, which was indicated by yellow, brown and tan particulates, mainly discovered in the cytoplasm of epithelial cells or glandular epithelial cells. A Ectopic and eutopic endometrial staining and H-SCORE values of TrKB in stage II. B Ectopic and eutopic endometrial staining and H-SCORE values of TrKB in stage III. C Ectopic and eutopic endometrial staining and H-SCORE values of TrKB in stage IV. D H-SCORE values of TrKB expression of both proliferative (left) and secretory (right) phases for ectopic and eutopic endometrium in the endometriosis group and normal endometrium in the control group. *, P < 0.05; ∗ ∗ , P < 0.01; ∗ ∗ ∗ , P < 0.001