Endometrial effects of oral estradiol and progesterone given alone (E+P) or with testosterone co-therapy (E+P+T). Data correspond to low dose T phase only. Figures indicate nuclear expression of Ki67 (A), progesterone receptor (PGR) (B), and estrogen receptor alpha (ESR1) (C) as determined by immunolabeling. n = 7, 8, and 10 for Con, E+P, and E+P+T groups, respectively, for all measures. *P < 0.05 and **P < 0.01 compared to control group (Con).