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Many-day rhythms of proliferative activity of the corneal and esophageal epithelium and serum corticosterone levels were studied in adult male Wistar rats. We detected a 4-day rhythm of proliferative activity of esophageal epithelium negatively correlating with corticosterone level. A more pronounced decrease in the number of mitoses in the esophageal and corneal epithelium was recorded every 12 days...
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