I. Histochemical distribution of acetylcholinesterase in the central nervous system: clues to the localization of cholinergic neurons (L.L. Butcher and N.J. Woolf). II. Choline acetyltransferase-containing neurons in the rat brain (H. Kimura, P.L. McGeer and Jeng-Hsiung Peng). III. Serotonin-immunoreactive neurons and their projections in the CNS (H.W.M. Steinbusch). IV. Immunohistochemical localization of histamine in neurons and mast cells in the rat brain (H.W.M. Steinbusch and A.H. Mulder). V. Neurons containing or accumulating transmitter amino acids (O.P. Ottersen and J. Storm-Mathisen). VI. GABA-T-intensive neurons in the rat brain (T. Nagai, P.L. McGeer, M. Araki and E.G. McGeer). VII. Cholinergic receptors (A. Rotter). VIII. Serotonergic receptors (R.C. Meibach). IX. Catacholamine receptors (J.M. Palacios and J.K. Wamsley). X. Amino acid and benzodiazepine receptors (J.K. Wamsley and J.M. Palacios). XI. Histaminergic receptors (J.K. Wamsley and J.M. Palacios). Subject index.