for serum concentrations of 10-15 nm the bound fractions were 28.8 +/- 2.2 % , 25.7 +/- 1.7 % and 22.2 +/- 2.2 % for ( +/- ) -isoproterenol ( ipr ) , ( +/- ) -norepinephrine ( ne ) and ( +/- ) -epinephrine ( epi ) , respectively .
C0028351
norepinephrine
C0014563
epinephrine