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Diagrammatic scheme of IS1 insertion into the ompF gene. The ompF gene of S. marcescens was interrupted by the insertion of the IS1 sequence at the 129th nucleotide position of the ompF gene. Putative promoter sequences of the opmF gene are indicated by boldface and underlined type. Right and left inverted repeats (IRR and IRL, respectively) of the IS1 sequence are also indicated by boldface and underlined type. Direct repeats (DRs) flanking the IS1 region are indicated by boxes.
