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The vaginal exfoliated cells of rats observed by microscopic analysis. (a) Preoestrus: most cells are nucleated epithelial cells. (b) Estrus: large numbers of keratin epithelial cells. (c) Postestrus: several kinds of cells including nucleated epithelial cells, keratin epithelial cells, and leukocyte. (d) Anestrus: large numbers of leukocyte and a small amount of mucus.
