“Atenolol, 10(-6) M, and butoxamine, 3 X 10(-8) M, beta-1 and beta-2 antagonists, respectively, … 10(-8) M. Tazolol, 3 X 10(-7) and 10(-6) M, a beta-1 agonist, and salbutamol , 10(-8) and 3 X 10(-… dependently increased the evoked release of epinephrine.”