FIG. 4.
Profiles of plasmids extracted from representative type 1a and 4a S. flexneri strains. Plasmids were prepared as described in Materials and Methods and subjected to agarose gel (0.8%) electrophoresis. Lanes: M, markers containing 11 supercoiled plasmids (numbers to the left of the gel are in kilobases); 1aI, S. flexneri 90e4802; 1aII, S. flexneri 91e110; 1aIII, S. flexneri 86e48398; 1aIV, S. flexneri N02.115; 4aI, S. flexneri 92e0537; 4aII, S. flexneri 90e6312; 4aIII, S. flexneri 91e1351; 4aIV, S. flexneri 90e2459.