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Gestational change of the contractile response to thrombin in the rat myometrium. (a) Comparison of the contractile response to thrombin based on the day of pregnancy. Contractile response was evaluated by the area under the tension trace, assuming those obtained with 40 mM K+ to be 100%. The data are the mean±s.e.mean (n=3–7). *P<0.05 as compared with the non-pregnant rats.
