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The effect of exogenous progesterone treatment (which was halted on E18, as indicated by arrowheads) on the gestational profile of active caspase 3 proteins in the pregnant mouse uterus is shown by representative Western blots. Active caspase 3 levels were normalized to calponin. Data are presented as mean ± SEM (n = 3–4 at each time point). *Progesterone-treated samples significantly different from control samples (P < 0.05).
