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Determination of metaphase II entry in oocytes pre-exposed to ferrocenyl 4-(alkylamino)-1,4-dihydroquinolines. After incubation or not with compounds 9, 6, 10, 7, 11, 8 for 24 h, oocytes were rinsed four times in ND96 for 30 min, before progesterone stimulation. White spot appearance was scored after 15 h. N refers to the number of females and n to the number of oocytes (N = 2 and n = 60).
