gp100 209-217 Pos. 210M (HLA-A*02:01) IMDQVPFSV is a linear peptidic epitope studied as part of Melanoma antigen preferentially expressed in tumors from Homo sapiens (human). This epitope has been studied for immune reactivity in several publication, tested in T cell assays and MHC ligand assays. This modified gp100 peptide amino acids 209 to 217 is a MHC-associated HLA-A2.1-restricted epitope derived from melanoma antigene. It can be processed, presented, and recognized by T cells. Alteration of the gp100 209-217 peptide to gp100 209-217 Met2 at the second amino acid changing threonine to a methionine was found to increase the affinity for MHC-associated HLA-A2.1 resulting in enhanced induction of T cells reactive to native gp100