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Major accessory gene elements found in IncA/C plasmids peH4H, pAM04528, pAR060302, and pSN254. Shown are the floR resistance region (found in all four plasmids), the aadA resistance region (found in peH4H, pAR060302, and pSN254), the kan resistance region (found in peH4H only), and the merA resistance region (found in all four plasmids). H, hypothetical open reading frames.
