epinephrine , norepinephrine and isoproterenol appeared to be rapid and potent stimulators of intracellular camp accumulation , the half maximum increase doses being 4 x 10 ( -7 ) m , 1 x 10 ( -5 ) m and 5 x 10 ( -7 ) m , respectively .
C0014563
epinephrine
C0028351
norepinephrine