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Schematic survey of sequences flanking the conserved eltAB operon of different Ent plasmids. DNA sequencing revealed an upstream-located A box (236 bp) and a downstream-located B box (280 bp), which are conserved in all analyzed plasmids. Mainly partial copies of different IS elements are closely associated with the eltAB operon structure. Isolate S6 carries a plasmid with the right end of IS91 fused to the A box.
