Abstract The transcriptional antisilencer VirB acts as a master regulator of virulence gene expression in the human pathogen Shigella flexneri. It binds DNA sequences (virS) upstream of VirB-dependent promoters and counteracts their silencing by the nucleoid-organizing protein H-NS. However. its precise mode of action remains unclear. https://www.ealisboa.com/great-deal-Pentair-Union-Collar-2-U11-200PS-super-offer/