Colored boxes indicate the class of the host bacterial species; pink, Alphaproteobacteria; blue, Betaproteobacteria; yellow, Gammaproteobacteria; green, Deltaproteobacteria. The red outlines enclose bacteria in the Enterobacteriaceae family. Asterisks (*) denote prophage MCPs. Phages in the plot are listed with host species, genome accession numbers, and MCP locus tags in Table S2. The unrooted Clustal X tree (Larkin et al., 2007) shows selected bootstrap values out of 1000 trials, and branches with bootstrap values less than 800 are collapsed.