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Salmonella invasion program. (A) Diagram of transcriptional cross talk between the flagellar, SPI1, and type 1 fimbrial gene systems. (B) Inferred logic of transcriptional cross talk, where the decision to “move” results from flagellar gene expression, the decision to “invade” results from SPI1 gene expression, and the decision to “persist” results from type 1 fimbrial gene expression.
