Figure 7

Phylogram of 90 selected viruses for which genomic sequences are available. The organisms were grouped by using distance matrices based on the sums differences from the other organisms for the 256 tetranucleotide combinations, as described in Materials and Methods. Phylogenies were created by neighbor-joining analysis. Colors indicate double stranded DNA viruses (red); single stranded DNA viruses (yellow); retroviruses (green); negative-sense single stranded RNA viruses (blue); positive-sense single stranded RNA viruses (sky blue); and double stranded RNA viruses (black). Bootstrap values >50 based on 100 replicates are represented at each node, and branch length index is indicated below the phylogeny.