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Schematic diagram of the insertion (IS) sites of ISPpu21 in the srpS gene in P. putida S12TS. The two black triangles indicate the two different insertion points of ISPpu21 in srpS. The sequences of the upstream and downstream terminal inverted repeats (IR-U and IR-D), as well as the sequences adjacent to these terminal repeats, have been marked with boxes. The nucleotides not belonging to either srpS or ISPpu21 are shown in boldface.
