There is a much closer correspondence between the effects of IHF among the genes of the SPI2 pathogenicity island : the ssrA ssrB regulatory genes are downregulated in the absence of either IHF , as are the genes .
There is a much closer correspondence between the effects of HU among the genes of the SPI2 pathogenicity island : the ssrA ssrB regulatory genes are downregulated in the absence of either IHF , as are the genes .