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hcp2 promoter activity is very low in bacteria inoculated into tomato leaves. pPP, luciferase gene with no promoter; phcp2-LUC, promoter fusion construct. Luminescence counts per 106 viable cells, determined as CFU, are shown. n = 4; error bars indicate SDs, and P values indicate the statistical significance of the difference between the hcp2 promoter and the promoterless construct (Student's t test).
