Humane Genome Center in Tokyo provides information on the molecular structure and pathways of various neurotransmitters.

View structural models of amphetamine, ephedrine, epinephrine, and mescaline. Displays atomic coordinates in the Protein Data Bank format.

View microscopy images of neurotransmitters from the Molecular Expressions Photo Gallery.

Brief summary of neurotransmitters and receptors covers chemical makeup and the roles played by different transmitters, such as melatonin.

Detailed account of how differing levels of tryptophan, tyrosine, and choline affect the production of certain neurotransmitters.