mRNA levels of other PhoP-regulated genes ( mig-14 , pagC , and pagD ) also asymptotically reached the steady-state levels in the EG14943 strain , which is shown in fig .
To further investigate the association between tdcA with phoP , we constructed chromosomal lacZ fusion strains of PhoP-regulated ( mgtA and pagD ) and SPI2 genes ( ssaG and sseA ) ( Navarre et al. , 2005 ) .