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The conserved arrangement of hrp/hrc genes within the Hrp Pais of Psy 61, Psy B728a, and Pto DC3000. Regions sequenced in B728a and DC3000 are indicated by lines beneath the strain 61 sequence. Known regulatory genes are shaded. Arrows indicate the direction of transcription, with small boxes denoting the presence of a Hrp box. The triangle denotes the 3.6-kb insert with phage genes in the B728a hrp/hrc region.
