with this method -- negative chemical ionization gas chromatography-mass spectrometry -- the more physiologically active m-octopamine has been found in association with p-octopamine in 10 organs of the rat . m-octopamine is present in concentrations equal to those of p-octopamine in heart , spleen , and liver and in concentrations from 30 to 60 % of p-octopamine in adrenals , vas deferens , brain , kidney , large intestine , bladder , and lungs .
C0086045
concentrations
C0006104
brain