FIG. 3.

Southern hybridization with an ISBcen20 probe (A) and PFGE (B) of seven individual colonies (lanes 1 to 7, respectively) of ST-32 strain CZ1238 exposed to 0.01% H₂O₂. Lanes 8, unexposed CZ1238. (A) Profiles in lanes 1 and 4, lanes 2 and 3, lanes 5 and 7, and lanes 6 and 8 match each other completely. The approximate positions of the molecular size markers (in kilobases) from the agarose gel electrophoresis of the DNA for the Southern hybridization are shown on the left. (B) Profiles in lanes 1, 4, 5, and 7 match each other completely. The positions and sizes (in kilobases) of the markers run for PFGE are shown on the left.