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Internalization of E. coli in lettuce leaf. Salmonella SL1344, and E. coli O157:H7 were grown overnight in LB or LBNS medium, washed and tested for internalization. The incidence of internalization was calculated and is presented as described in the legend of Figure 1. The data are the average of 4 independent experiments each performed in triplicates. Different letters indicate significant difference (P < 0.05) according to ANOVA Tukey–Kramer Multiple Comparisons Test.
