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Expression levels of type III secretion system (T3SS) genes. Transcript levels of four genes (gyrA, hopP1, hrpA and hrpL) of Pseudomonas syringae pv. tomato DC3000 treated with 2.5 mM of 4-hydroxybenzoic acid and vanillic acid were normalized by the expression of internal control gene, recA. The data is representative of three independent experiments with three replicates. Asterisks on the bar indicate significant difference (*P < 0.05).
