Figure 1

Tetranucleotide difference analysis of representative bacteriophage genomes (H. influenzae phage HP1, B. cepaciae phage 781, and Enterobacteria phage Mu). Tetranucleotide differences were determined with window and step sizes of 5,000 and 1,000, respectively, and Z-scores were determined as described in Materials and Methods. Solid black lines represent Z-scores of ± 3.