Comparison of the functional structure of the CDT-1Φ genome with those of prophage UTI89, prophage-like element B171, and bacteriophage SfV. The numbers in the bars indicate the homology between CDT-1Φ and each phage (UTI89 prophage, B171-prophage-like element, or bacteriophage SfV). The numbers below the bars indicate the size of each region, and the vertical arrow at the top indicates the attP site.