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Mean frequencies of groups of amino acids in the 167 bacterial genomes plotted against genomic GC content. Mean frequency of amino acids, which are encoded by TGN, NAT, NGT, or NTT codons, are marked in red, blue, green, and black, respectively. NAT, NGT, and NTT codons may lend a dinucleotide to one of the start codons in phase 1. TGN codons may lend a dinucleotide to one of the start codons in phase 2.
