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Relaxant effect of different concentrations of 17β-estradiol (A) and progesterone (B) on KCl-contracted arteries in presence or absence of the following different potassium channel inhibitors: glibenclamide (GLI; 10 μmol/L); 4-aminopyridine (4-AP; 1 mmol/L); and tetraethylammonium (TEA; 1 mmol/L). Each point represents the mean value±SEM (indicated in vertical bars) from the number of experiments shown in brackets.
