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The data were obtained using uterine strips from rats at gestational day 16 following 24 h treatment with placebo (grey bars; n = 5) or RU486 (stippled bars; n = 18). For comparison, data are also presented for rats at day 21 or 22 in active labour (black bars; n = 9 or 10). Bars with unique superscripts are significantly different from bars without overlapping superscripts.
