I. Distribution of neuropeptides in the Central nervous system using biochemical micromethods (M. Palkovits and M.J. Brownstein). II. General morphological features of peptidergic neurons (V.M. Pickel). III. Vasopressin, oxytocin and their related neurophysins (M.V. Sofroniew). IV. LHRH-containing systems (J. Barry, G.E. Hoffman and S. Wray). V. alpha-endorphin, beta-MSH, ACTH, and related peptides (H. Khachaturian, M.E. Lewis, Kang Tsou and S.J. Watson). VI. Distribution of enkephalin-containing neurons in the central nervous system (P. Petrusz, I. Merchenthaler and J.L. Maderdrut). VII. VIP-containing neurons (G.M. Abrams, G. Nilaver and E.A. Zimmerman). VIII. Neurotensin-containing neurons (P.C. Emson, M. Goedert and P.W. Mantyh). IX. Neuronal-cholecystokinin (J.J. Vanderhaeghen). X. An atlas of the distribution of GABAergic neurons and terminals in the rat CNS as revealed by GAD immunohistochemistry (E. Mugnaini and W.H. Oertel). Subject index.