PBMC were stimulated for twenty days with a peptide of either the bole1a or an identified circulating sequence of that same epitope. In the upper right corner of each graph, the sequence used to expand is shown with amino acid differences from bole1a underlined. The resulting lines were tested against titrated concentrations of peptides in duplicate wells encoding the bole1a sequence (--•--) and all identified circulating variants of that epitope (open shapes) in an IFN-gamma ELISpot assay. (A) HLA B*07 HCV Core 41-49, subject 109 (B) HLA C*07 HCV E2 610-618, subject 109 (C) HLA A*02 HCV E2 614-622, subject 18 (D) HLA A*11 HCV E2 621-628, subject 109 (E) HLA A*29 HCV 97 790-799, subject 109 (F) HLA A*02 HCV NS3 1073-1081, subject 160 (G) HLA A*26 HCV NS3 1111-1120, subject 109 (H) Sum of the magnitude of ELISpot response at peptide dilutions of 10, 1, and 0.1uM (y-axis) when peptides encoding bole1a or a naturally circulating variant was used to expand the T cells (x-axis). The lines connect the bole1a epitope to its corresponding variants.