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Hormone and receptor levels during the antral follicle stage. Follicle growth and atresia are accompanied by variations of gonadotropin levels (orange and light-blue lines) and receptors (dotted lines). Changes in sex steroid hormone levels are represented by green (androstenedione), pink (estradiol), and blue (progesterone) lines. Timeline is to be referred to the first day of the menstrual cycle (day 0) until ovulation (day 15) (adapted and merged from [42–44])
