Notably , after all strains were induced simultaneously by GEN Citation : to the 15th passage at subinhibitory concentrations , strain JS △ cpxR/pcpxR showed significant increases in d mdtA genes , Huang H , Sun Y , Yuan L , Pan Y , Gao Y , Ma C and Hu G Regulation of the Two-Component Regulator CpxR on Aminoglycosides and β-lactams Resista in Salmonella enterica serovar Typhimurium .