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mutation rates in the mtDNA D-loop region of the AGS cells after stimulation by Hp extracts of various concentrations. The mutation rates increased with the increase in the concentration of Hp extracts. After stimulation by Hp extracts of 120 µg/ml, 240 µg/ml, 480 µg/ml and 960 µg/ml, the mutation rates in the Hp11638 group were remarkably higher than those in the Hp11638M group (P<0.01).
