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Physical map of the amr locus in P. aeruginosa. Arrows designate complete ORF. The region downstream of amrB contains two ORFs, one (HP) with homology (54% similar) to yjiK, encoding a hypothetical protein from E. coli, and the other (TR) possessing homology (74% similar to merR from Archaeoglobus fulgidus) to the MerR family of bacterial response regulators. See Materials and Methods for a detailed description of the representative plasmids.
