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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: Front Neuroendocrinol. 2010 Feb 19;31(2):217–231. doi: 10.1016/j.yfrne.2010.02.003

Figure 2.

Figure 2

Plasma concentrations of estradiol (E2) and progesterone (P4) throughout the human menstrual and rat estrous cycles. Values represent the means of measurements taken daily from women and at two-hour intervals from rats. The four-day estrous cycle is broken down into its stages: diestrus-1 (D1), diestrus-2 (D2), proestrus (P), and estrus (E). Vertical lines indicate ovulation. Modified from [207] and [66].