A tricyclic ring system replaces the variable regions of peptides presented by three alleles of human MHC class I molecules. Weiss GA, Collins EJ, Garboczi DN, Wiley DC, Schreiber SL. A tricyclic ring system replaces the variable regions of peptides presented by three alleles of human MHC class I molecules. Chem Biol. 1995;2(6):401-7. Read more