Identification of genes expressed in cultures of E. coli lysogens carrying the Shiga toxin-encoding prophage Φ24B.

CM7 is an ORF of 8 kb, and as the amount of DNA that can be packaged by a phage is limited, such a large gene is likely to be conserved only if it confers an advantage to the phage or its lysogen; it may be significant that this large gene is associated with several other phages (Table 3 ).

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