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Amino acid frequency in the proteomes of the various virus species. The frequency of amino acids in the proteome of 6 HAV genotypes is similar to that of 8 other virus species (a) while three other virus proteomes more resemble the average of HCV and HEV (b). In both panels, the amino acids are ordered for decreasing frequency in HAV. The average amino acid frequency of HAV is added to panel (b) for comparison
