Immunohistochemical evaluation of estrogen receptor α in the uterus of female Sprague-Dawley rats at post-natal day 21. Receptor expression was apparent in the perimetrium (p) and endometricum (e), but not in the myometrium (m) and luminal epithelium (le). Desaulniers et al. describe the effects of aryl hydrocarbon receptor agonists on expression patterns in this issue (pp. 175–184).
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