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Estrous cycle changes in representative rats from diverse groups. (A) Vaginal smears of proestrus stage. (B) Vaginal smears of estrus stage. (C) Vaginal smears of metestrus stage. (D) Vaginal smears of diestrus stage. (E–H) Representative estrous cycles of diverse groups: 1, diestrus stage; 2, proestrus stage; 3, estrus stage; 4, metestrus stage. Original magnification (×100).
