Since the initial discovery of the G protein-coupled receptor system that regulates cyclicAMP production, the G protein field has rapidly expanded. Cell surface receptors that couple to heterotrimeric G proteins, the G prote- coupled receptors (GPCRs), number in the hundreds and bind to a wide div- sity of ligands including, biogenic amines (e. g., adrenaline), lipid derivatives (e. g., lysophosphatidic acid), peptides (e. g., opioid peptides), proteins (e. g., thyroid-stimulating hormone), and odorants to name a few. The GPCR system is found throughout biology in such simple organisms as...

Since the initial discovery of the G protein-coupled receptor system that regulates cyclicAMP production, the G protein field has rapidly expanded. Cell surface receptors that couple to heterotrimeric G proteins, the G prote- coupled receptors (GPCRs), number in the hundreds and bind to a wide div- sity of ligands including, biogenic amines (e. g., adrenaline), lipid derivatives (e. g., lysophosphatidic acid), peptides (e. g., opioid peptides), proteins (e. g., thyroid-stimulating hormone), and odorants to name a few. The GPCR system is found throughout biology in such simple organisms as...