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The presence of antagonists of nuclear androgen or estrogen receptors did not prevent the uncoupling effects of sex steroid hormone derivatives. The relative permeability constant was estimated in cardiac cells in control conditions, in the same cells exposed for 24 h to cyproterone acetate (Cypro. ac.; 25 μM) or tamoxifen (Tamo.; 1 μM), then after they had been exposed for 15 min to testosterone propionate- (TP) or estrogen propionate-(EP) containing (25 μM) solutions
