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Antibiotics inhibit the expression of T4SS but does not affect the copy number of pEIB202. a Copy number of pEIB202 in WT grown with or without antibiotics at their sublethal concentrations or in ∆esrB measured by qPCR. b qRT-PCR analysis of the expression of T4SS genes in WT grown with or without antibiotics at their sublethal concentrations (1/4 of MIC). * P < 0.01, ** P < 0.001, ***P < 0.0001, student’s t-test
