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Model of hrp gene regulatory cascade in R. solanacearum induced in response to bacterium-plant cell contact. PhcA is a negative regulator of hrp regulon. Lines with arrows represent positive regulation of gene expression. Open arrowheads represent protein translation. A solid arrow indicates cell nutrient status related to growth conditions. O.M., outer membrane; I.M., inner membrane. (Modified from reference 4 with permission of the publisher.)
