the isc 's elicited by isoproterenol , epinephrine , and norepinephrine were dose dependent , with respective ec50 values of 1.5 x 10 ( -8 ) m , 5.0 x 10 ( -6 ) m , and 1.1 x 10 ( -5 ) m .
C0014563
epinephrine
C0028351
norepinephrine