Additional File 2.

Vectorial profiling of tetra-nucleotide usage pattern in seven RNA viruses. The tetra-nucleotide frequencies of occurrence in seven viral genomes. Each column represents a tetra-nucleotide usage pattern V_i for a single virus. We derived correlation coefficient (r) by comparing any two columns simultaneously. This parameter r indicates the likeness of word usage patterns in any two viruses.

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Yap et al. BMC Bioinformatics 2003 4:43   doi:10.1186/1471-2105-4-43