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. 2016 Aug 11;11(8):e0160984. doi: 10.1371/journal.pone.0160984

Fig 5. Mean serum hormone levels are presented as mean + SEM in intact female rats.

Fig 5

*The level of oestrogen was the highest at proestrus (P<0.05). # The level of progesterone was the highest at diestrus and proestrus compare to estrus (P<0.05). $Meanwhile, relaxin level was the highest at diestrus compare to 3 other stages of estrous cycles (P<0.05). A strong positive correlation (r = 0.901 & p<001) was observed between serum progesterone and relaxin levels throughout the phases of the estrous cycle.