Fig. 4 ITLCFTLKR Epitope interaction with an antigen-binding pocket of HLA-A*68:01, of MHC I-HLA Allele. Here, Threonine at 2nd and 6th position, as well as cysteine at the 4th position in epitope, generate preferably a hydrogen bond due to the presence of partially charged positive and negative atoms, while other amino acids result in van der Waals interactions.