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Southern blotting and hybridization with intI1 (A)- or intI2 (B)-specific probes. Lane M, size marker consisting of λ phage DNA digested by PstI. (A) DNA of 14 strains of S. flexneri (lanes 1 to 14) and 2 strains of S. dysenteriae (lanes 15 and 16) digested with EcoRI. (B) DNA of 14 strains of S. sonnei (lanes 1 to 14) and 1 strain of S. boydii (lane 15) digested with HindIII.
