Figure 4. Schematic representation of the PreS deletions and the mutations in the small surface gene of the HBV strains isolated from the HIV/HBV co-infected patients of eastern India.

(A) The PreS deletions are indicated by dashed lines (–). The numbers ahead of each deletion indicates the starting point of the respective amino acid deletions whereas the numbers besides the triangle (▴) indicates the length of each deletion observed in the co-infected individuals. (B) The major mutations occurring frequently within the small surface gene of HBV are shown here. The substitutions marked with a star (*) are mainly contributed due to the presence of the HBV/D2 sequences.