Construction of prokaryotic expression system of 2 148-bp fragment from cagA gene and detection of cagA gene, CagA protein in Helicobacter pylori isolates and its antibody in sera of patients

Figure 3 Comparison of putative amino acid sequence homology of cagA1 fragment between different H pylori strains. (1): Corre-sponding putative amino acid sequence of cagA1 fragment from H pylori strain NCTC11637. (2): Putative amino acid sequence of cagA1 fragment from H pylori strain Y06. Underlined is the position of the primers.