Biosynthesized Enzymes (IMAGE) University of California - San Diego Caption This image shows enzymes that biosynthesize the neurotransmitters: Dopamine (left), norepinephrine (center) and epinephrine (right). Credit UC San Diego School of Medicine Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.