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Helicobacter pylori DNA detection. (a) Gel electrophoresis of polymerase chain reaction product of ureC (136 bp) gene. (b) DNA sequencing for the presence of ureC in one patient with vocal polyp and laryngeal Helicobacter pylori infection (genotype: Puno135). Lane 2: positive ureC; Lane 1: negative ureC; P: positive control; N: negative control; M: 100-bp DNA marker.
