3,4-dihydroxyphenylethylamine
A hormonelike substance with the chemical formula C8H11NO2. It is found in the nervous system as an important neurotransmitter, or substance which transmits nerve signals from neuron to neuron. It is also an intermediate in the productions of the hormones epinephrine (adrenaline) and norepinephrine.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.