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SOX2, NANOG, and OCT4 immunohistochemical staining. Paraffin-embedded normal (n = 6) and paired eutopic and ectopic endometrium specimens (n = 7) were examined. SOX2, NANOG, and OCT4 immunostaining in normal endometrium (C, H, M) of control and in eutopic endometrium (D, I, N) and ectopic endometrium (E, J, O) of endometriosis, and positive control (A, F, K) and negative control (B, G, L) were revealed, respectively (×400 magnification). Arrows denote positive staining.
