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Effects of GNC on estrogen levels and endometrial thickness. A. Serum levels of estrogen; B. Endometrial thickness; C. endometrium stained with hematoxylin and eosin under a light microscope in the OVX+GNC, OVX+E, OVX, and Sham groups. Data are expressed as mean values ± S.D. (n = 8). *P < 0.05, **P < 0.01.
