This symposium series was estab1ished in 1976 for the purpose of bringing together, once every two or three years, active investigators in the forefront of contemporary immuno1ogy, to present their findings, discuss their significance in the light of current concepts and identify important new directions of investigation. The founding of the symposium was stimu1ated by the achievement of major breakthroughs in the understanding of the immune recognition of proteins and peptides. We be1ieve that these breakthroughs will lead to the creation of a new generation of peptide reagents which shou1d...