FIGURE 1.

Identification of the estrous cycle phases in C57BL/6J female mice. (A) Vaginal cytology presenting each stage of the mouse estrous cycle. (B) Estrous cycles of eight C57BL/6J female mice over 16 days; black rectangle represents typical estrous cycles. (C) Average duration of estrous cycles of C57BL/6J female mice; data was acquired from typical estrous cycles including the above four phases in 19 mice.