and ( b ) naloxone at lower concentrations ( 3 x 10 ( -7 ) , 3 x 10 ( -6 ) , and 3 x 10 ( -5 ) m ) augmented the vasoconstrictor effects of epinephrine and norepinephrine without altering kcl- or serotonin-induced constriction .
C0014563
epinephrine
C0028351
norepinephrine