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 2 Comparison of nucleotide sequence homology of cagA1 fragments between different H pylori strains. (1): Corresponding nucleotide sequence of cagA1 fragment from H pylori strain NCTC11637. (2): Sequencing result of cagA1 fragment from H pylori strain Y06. “///” indicates the deletion mutation of the nucleotide residuals. Underlined is the position of the primers.