FIG. 2.

Structures of two forms of truncated bacteriophages of stx₁-negative E. coli O157:H7. Inserted GTT and TGACTGTT sequences replace segments that are found in truncated stx₁ bacteriophages in two sequenced strains. ORF borders, proportions, and designations and nucleotide positions relate to those in reference 16. An A→G SNP 108 nucleotides 5′ to the octamer in both sequenced Δ18,895 bacteriophages and primer locations used to generate data pertaining to stx₁ bacteriophages are noted. A, E, I, K, L, J, F, and B are primers.