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Nucleotide composition of the codon positions 1, 2, and 3 (CP1, CP2, and CP3, respectively) in astrovirus ORF1a, ORF1b, and ORF2. Relative proportions of the nucleotides are given on the X-axis. Vertical lines represent the average proportion of the respective nucleotide. Symbols in bold indicate the deviant nucleotide preferences characteristic for the non-human mammalian viruses.
