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General organization of the R. solanacearum hrp gene cluster according to Van Gijsegem et al. (45). Thick arrows symbolize individual genes. Single letters refer to hrp genes, while gray arrows and black outlined letters represent hrc genes. The arrow filled with a grid represents a regulatory gene. Numbers above thin arrows indicate transcriptional units. Flags indicate the presence of a Xanthomonas PIP box-like motif in the respective promoter.
