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. 2010 Feb 1;10:34. doi: 10.1186/1471-2180-10-34

Figure 1.

Figure 1

Schematic representation of the inactivation of CovS. A. Inactivation of CovS in the serotype M49 strain 591. Plasmid pUCerm::covS contains a fragment internal of covRS and confers erythromycin resistance (EmR). The genomic regions from both covR and covS used for recombination are marked in black. B. M49 covRS locus after insertion of the plasmid pUCerm::covS. The thin arrows depict primers used for RT-PCR analysis (see below). The thick numbered arrows (1-4) represent primers used for PCR of whole region and junction fragments to confirm plasmid integration into the chromosome. C. RT-PCR analysis. Primer pairs derived from covR and covS were used. Lane DNA Ladder, O'GeneRuler 1 kb DNA Ladder (Fermentas); gDNA, genomic DNA; cDNA, first-strand synthesized cDNA; mRNA, messenger RNA; -C, negative control, where no template for polymerization was used.