a remarkably sensitive , simple and selective reversed-phase high-performance liquid chromatographic ( hplc ) method has been developed , allowing , for the first time , the direct measurement of histamine , norepinephrine , octopamine , normetanephrine , dopamine , serotonin and tyramine in a single sample of plasma ( 2 ml ) , tissue ( 0.2 g ) , or urine .
C0028351
norepinephrine
C0028385
normetanephrine