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a. Photographs showing representative samples of lettuce midribs after 6 days of infection with FRD1 and PAO1 and their efhP mutant strains FRD1043 and PAO1043. Complementing with efhP in trans on plasmid pMF470 partially restored the zone of infection. b. The areas of disease were measured and the percent change vs. wild types was calculated. The experiments were repeated at least two times, with 3–5 biological replicates each.
