All HCV T-Helper (Th) epitopes mapped to within a region of 21 amino acids or less are indicated on the protein epitope maps. The location and HLA restriction elements of Th epitopes are indicated on protein sequences of H77. These maps are meant to provide the relative location of defined epitopes on a given protein, but the H77 sequence may not actually carry the epitope of interest, as it may vary relative to the sequence for which the epitope was defined. Epitopes with identical boundaries and HLA fields are included in the maps only once. If one laboratory determines HLA presenting molecules at the serotype level (example: A2) and another at the genotype level (example: A*0201) both will be included in the map. MHC specificities are indicative of the host species; when no MHC presenting molecule is defined, the host species is noted.