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Schematic representation of the I factor insertion in the rl gene. The white and shaded lines represent 125 bp of the rl exon 2, and 394 bp of the rl intron 2 respectively; the filled line represents the 5′ end of the I factor. Dashed lines represent rlIR1 genomic sequences and I factor sequences that were not included in the 982-bp PCR fragment. The I factor insert is not in scale.
