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Figure 1 :Vaginal smear of rat showing different phases of estrus cycle: (a) Diestrus, (b) proestrus, (c) estrus, and (d) metestrus.

Figure 1 :Vaginal smear of rat showing different phases of estrus cycle: (a) Diestrus, (b) proestrus, (c) estrus, and (d) metestrus.