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.