'Further establishes the reputation of the series...an invaluable resource.' -Trends in Pharmacological Sciences, from a review of Volume 3 Volume 4 explores such emergent topics as: three-dimensional conceptions of ion channel proteins based on the available structural and functional data; the structure, pharmacology, and regulation of the GABA_A receptors; and the Ca2+-dependent K+ channels in adrenal chromatic cell membranes.