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Agarose gel electrophoresis of RT-PCR products. RT-PCR products observed using primers to amplify intergenic regions between (lanes 1 and 2) tdiS and tdiR, (3 and 4) bssD and bssC, (5 and 6) bssC and bssA, (7 and 8) bssA and bssB, (9 and 10) bssB and bssE, and (11 and 12) bssE and orf2. Odd-numbered lanes are controls without reverse transcriptase. Numbers on the left represent sizes of markers (in base pairs).
