PCNA immunoperoxidase-stained cell nuclei. High number nuclei staining could be seen in the group which received estrogen plus progesterone-only treatment and estrogen plus progesterone in the presence of 100 mg/kg/day quercetin, with the latter has a relatively higher number of peroxidase reaction in the nuclei than the former. Stainings were mostly seen in the stroma. In E+P plus 100 mg/kg/day group, stainings were also seen in the glands. A = control, B = estrogen plus progesterone, C = estrogen plus progesterone with 10 mg/kg/day quercetin, D & E = estrogen plus progesterone with 100 mg/kg/day quercetin.