SUMMARY
Long and Evans in 1922 first established that the rat estrous cycle consisted of four distinct phases, subsequently labeled proestrus, estrus, metestrus and diestrus, based on vaginal cytology; the cycle recurred every 4 days. Wang in 1923, employing running wheels, reported that the modal locomotor activity cycle of the female rat was 4 days: the peak in wheel-running corresponded to the presence of vaginal cornified epithelial_cells indicative of estrus, establishing a close link between the vaginal and behavioral cycles. In the modern era reports that the free running rhythm of locomotor activity of female rats is . . .
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