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Southern hybridization analyses of pulsed-field gels run with restriction enzyme-digested DNA extracted from type B isolate NCTC3110. The blot was first hybridized with an etx-specific probe (A) and then stripped and reprobed with a cpb-specific probe (B) before a final stripping and reprobing with a cpb2-specific probe (C). The migration of molecular size markers is indicated on the left.
