Western blot analysis of SOX2, NANOG, and OCT protein. (A) Relative levels of SOX2, NANOG, and OCT4 protein in normal endometrium (n = 6) and paired eutopic and ectopic endometrium (n = 13). Double-asterisk values are significantly different from single-asterisk values. Asterisks denote significant differences between eutopic or ectopic endometrium and normal endometrium. Connecting lines denote significant differences between eutopic and ectopic endometrium. P < 0.05 was significant. Error bars denote SEM. (B) Representative western blot of SOX2, NANOG, and OCT4 protein. GAPDH, Internal control.