The ovary isolation and culture were performed as reported by Cai et al. [49 (link)]. Briefly, the ovaries from 12.5, 13.5, 14.5, or 15.5 dpc mice were separated and washed by prechilled PBS three times, which were then cultured in 6-well culture dishes containing 1 ml of basic DMEM/F12 medium (Gibco, Life Technologies) at 37 °C in 5% CO2/95% air atmosphere with saturated humidity. Half of the medium was replaced every 2 days until the ovaries grew to the required stages. 25 μM D4476 was added to detect the effects of CK1α on folliculogenesis.
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