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Accumulation of progesterone in cultures of theca interna cells isolated from preovulatory follicles 36 h after injection of PGF2α to induce luteal regression and cultured in control medium (CM), with a luteinizing dose of LH (100 ng/ml), or with graded doses of PGE2 or PGF2α. Data are means ± SEM of duplicate cultures from each of 5 follicles. Within each time in vitro, values with different superscripts differ (P < 0.05).
