ERα-, ERβ-, and AR- immunoreactivities have overlapping, yet distinct, distributions in the CA1 region of the rat hippocampus. A. ERα-immunoreactive nuclei (arrows) are found primarily in the border of strata radiatum (SR) and lacunosum-moleculare (SLM). B. Extranuclear ERβ-immunoreactivity is evident in pyramidal cell perikarya and their apical dendrites in SR. A few, scattered ERβ-labeled interneuron perikarya also are found. C. AR-immunoreactivity is primarily observed in pyramidal cell nuclei and in a few scattered glial processes (arrowheads). SO, stratum oriens; SP, stratum pyramidale. Bars, 500 μm