Figure 1From: Relationship of SARS-CoV to other pathogenic RNA viruses explored by tetranucleotide usage profilingTwo Relationship trees based on the correlation coefficients of tetra-nucleotide usage bias The distance tree for 31 RNA viruses based on tetra-nucleotide usage pattern for the entire genome (right) and the replication enzyme (left). The correlation distances are shown on top of each branch.Back to article page