Expression of the phoP gene was not increased in intracellular bacteria , although we did observe the expected PhoPQ-regulated control of PhoP-activated genes ( pag ; examples include mgtBC and genes encoded by SPI2 ) and PhoP-repressed genes ( prg ; examples include genes encoded by SPI1 ) .
These regulated genes included induction of PhoP-activated genes ( pags ) pagCDPOK , virK , mgtBC , and pgtE , and repression of sopBD2 and the PhoP-repressed genes ( prgs ) prgHIJK .