Biological Activity Neurotransmitters:dopamine Bioregulators:epinephrine ·Vitamins:niacin,.Bs Alkaloids:nicotine,morphine,cocaine 。Amino acids > Chapter 19 3 Chapter 19 3 Biological Activity • Neurotransmitters: dopamine • Bioregulators: epinephrine • Vitamins: niacin, B6 • Alkaloids: nicotine, morphine, cocaine • Amino acids =>