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PFGE profiles of E. coli ONT:H25 strains (A) and E. coli O157:H7 strains (B). Lanes: M, λ DNA ladder (DNA size standards); a, E. coli ONT:H25 strain SH1; b, E. coli ONT:H25 strain SH2; c, E. coli ONT:H25 strain SH3; d, E. coli O157:H7 strain W1; e, E. coli O157:H7 strain W2; f, E. coli O157:H7 ATCC 43894.
