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With the aid of monoclonal antibodies specific to the estrogen and progestin receptors, we have examined the cellular localization of these proteins in the reproductive tract of male and female macaques. Two striking findings have resulted from our work with these new reagents. First, these receptors are detectable only in cell nuclei, regardless of hormonal treatment, and second, they are often detectable in stromal, but not epithelial cells when the epithelial cells undergo various estrogen or progestin-dependent events. The latter observation has led us to conclude that stromal cell-epithelial cell interactions may play previously unappreciated roles in the hormonal control of the primate reproductive tract. The lines of evidence that have drawn us to this conclusion will be reviewed.

Estrogen and Progestin Receptors in the Reproductive Tract of Male and Female Primates1