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Characterized region of Pph plasmid pAV511 found to contain the PAI. The DNA common to genomic clones pAV518 and pAV521 is marked by the underlying line. The positions of single Tn3 gus insertions that abolished restoration of virulence by pAV521 (gray arrows) and pAV518 (black arrows) are marked. Note that insertions that did not affect virulence were not mapped.
