Amino acid diversity in the NS5B polymerase region of 77 G1a and 39 G1b isolates from treatment-naïve HCV infected subjects.

Numbers in superscript represent the number of isolates with a particular noted residue. Amino acid representing the wild type is indicated in bold. Residues known for resistance substitutions are underlined. Note: For residue 426, the M426L has not been described as a mutation conferring resistance (see Table 2).