"The objective of this comparative study was to determine the influence of changes in estradiol and progesterone during ovulatory vs. anovulatory cycles on levels of estradiol receptor (ER) and progesterone receptor (PgR) in endometrium. Thirty women (range age 20-35 years) were divided into three groups: women with a history of habitual abortion, obese women with menstrual disorders, and women with regular ovulatory cycles as well as proven fertility," scientists in Mexico report.
"A single venous blood sample and an endometrial sample were simultaneously obtained during the secretory phase of the menstrual cycle, in order to measure estradiol and progesterone levels...
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