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Length tension relationships in the nonpregnant and pregnant rat uterus and the effect of antiprogestin
Length\p=n-\tensionrelationships and the tissue composition of the corpus and the cervix uteri were investigated in a rat model. Four groups of rats were used: nonpregnant (n = 12); day 18 of pregnancy treated with vehicle (n = 8); day 18 of pregnancy treated with the antiprogestin ZK 98 299 (Onapristone\s=r\) for 19 h (n = 8); and day 22 of pregnancy during spontaneous labour (n = 8). Increased extensibility and maximal contractility in both corpus and cervix uteri were demonstrated withdoi:10.1530/jrf.0.1130075 pmid:9713379 fatcat:ocluydvaevgnth3qwdlqofd2gq