Immunology has developed quite impressively over the past decade and perhaps very few fields in medicine or biology have grown so explosively. Completely new fields have been elucidated in depth. We recall only the definition of the nature and function of RLA antigens at the molecular level. the chemical and functional identification of several cytokines. and the correlation to particular immunological functions of specific epitopes present on cellular mem- branes. The extensive application of immunological techniques and concepts to the neurological sciences has led to the development of...