FIG. 1.
Detection of extrachromosomal DNA in strains of the O3:K6 pandemic clonal complex isolated in Chile. (A) PFGE of bacterial DNA from strains with (PMCs 58.5, 1.6, and 5.6) and without (PMCs 52.5 and 6.6) the extrachromosomal DNA. Lane MW, λ DNA and λ HindIII DNA molecular weight markers. (B) Gel electrophoresis of DNA extracted after alkaline hydrolysis from strains with (PMCs 110.5 and 58.5) and without (PMC 34.5) the extrachromosomal DNA. Lane ΛHindIII, λ HindIII DNA molecular weight marker.