Detection of integration of stx 2 phage DNA with E. coli MC1061 chromosome by PFGE analysis. Lane 1: Salmonella Braenderup, Lane 2: E. coli O157 G51, Lane 3: E. coli MC1061, Lane 4: E. coli MC1061-Lysogen. The bottom arrow mark denotes the position of the band in E. coli MC1061 which is missing in all lysogenic strains of E. coli MC1061. The arrow mark above denotes the intensity of a band in all lysogenic strains of E. coli MC1061 which is significantly higher than that of the non-lysogenic E. coli MC1061 strain
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