GLUTAMINE, GLUTAMATE, AND GABA: METABOLIC ASPECTS – H. S. Waagepetersen, U. Sonnewald, and A. Schousboe -- SERINE, GLYCINE, AND THREONINE – T. J. de Koning, S. A. Fuchs, and L. W. J. Klomp -- HISTIDINE – P. Panula -- AROMATIC AMINO ACIDS IN THE BRAIN – M. Cansev and R. J. Wurtman -- ARGININE, CITRULLINE, AND ORNITHINE – H. Wiesinger -- BRANCHED CHAIN AMINO ACIDS (BCAAs) IN BRAIN – S. M. Hutson, A. J. Sweatt and K. F. LaNoue -- SULFUR-CONTAINING AMINO ACIDS – G. J. McBean -- TAURINE – S. S. Oja and P. Saransaari -- NEUROBIOLOGY OF D-AMINO ACIDS – E. Dumin and H. Wolosker -- AMINO ACIDS AND BRAIN VOLUME REGULATION: COTRIBUTION AND MECHANISMS – H. Pasantes-Morales -- UREA CYCLE ENZYMOPATHIES – R. Butterworth -- AMMONIA TOXICITY IN THE CENTRAL NERVOUS SYSTEM – J. Albrecht -- DISORDERS IN AMINO ACID METABOLISM – M. Yudkoff -- N-ACETYLASPARTATE AND N-ACETYLASPARTYLGLUTAMATE – M. H. Baslow -- GLUTATHIONE IN THE NERVOUS SYSTEM: ROLES IN NEURAL FUNCTION AND HEALTH AND IMPLICATIONS FOR NEUROLOGICAL DISEASE – R. Janáky, R. Cruz-Aguado, S. S. Oja, and C. A. Shaw -- LOW MOLECULAR WEIGHT PEPTIDES – K. L. Reichelt.