Fig. 6.

Bar graphs depicting the effect of estradiol and progesterone treatments on NMDA-displaceable [³H]glutamate (A) and [³H]AMPA (B) binding in the regions of the hippocampus containing the apical (str. radiatum) or basal (str. oriens) dendrites of CA1 pyramidal cells. Filled bars represent binding in OVX+O animals; stippled barsrepresent binding in OVX+E animals; open bars represent binding in ovariectomized animals treated with both estradiol and progesterone (OVX+EP). Note that treatment with either estradiol or estradiol plus progesterone increases NMDA receptor binding with no effect on AMPA receptor binding. **, Significant difference from OVX+O (p < 0.01); *, significant difference from OVX+O (p < 0.05).