Advances in the Biosciences, Volume 44: Receptors as Supramolecular Entities exemplifies the concept of transmitter and cotransmitter interactions using GABA receptor as a model. The book contains papers on the interaction of sulpiride and other substituted benzamides with dopamine receptors where the result of receptor stimulation is not a stimulation of cyclic AMP formation. The text also offers a panoramic view of the concepts that are being elaborated to reach a better understanding of the function of the receptors for the most important neurotransmitters operative in brain.