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Structure of the 1.5-kb rpsL,erm cassette, which confers dominant streptomycin susceptibility and selectable erythromycin resistance. Open boxes designate open reading frames; solid line indicates noncoding sequences. The cassette contains 272 bp of C. jejuni sequence upstream of the C. jejuni rpsL gene (408 bp), a 145-bp spacer, and then the 735-nucleotide erm gene.
