Abstract

Fibroblasts isolated from the uteri of 5 guinea pigs were cultured in vitro to determine the effect of relaxin and estradiol. Both relaxin and estradiol increased thymidine uptake by fibroblasts. Thymidine incorporation with 1.5 μg/ml relaxin and no estradiol was 107% of control while 600 pg/ml estradiol and no relaxin gave 112% of control. Thymidine incorporation in the presence of 1.5 μg/ml relaxin and 600 pg/ml estradiol was 128% of control. This indicated a significant interaction between relaxin and estradiol.

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