Additional file 1.

Correlation coefficients between the frequencies of 11 amino acids in the three domains. The correlation between 20 standard amino acid frequencies was studied. Pearson correlation coefficients were used to evaluate the correlation between amino acid frequencies. The figure presents the correlations of 11 amino acids, which had significant correlations in frequency.

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Chen et al. BMC Evolutionary Biology 2013 13:219   doi:10.1186/1471-2148-13-219