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Differences in tRNA gene content across organisms. Codons boxed in blue denote tRNA genes often absent in bacteria and eukaryotes, while codons boxed in green denote genes mostly absent only in bacteria. Actual tRNA gene numbers and codon usage frequencies for humans and E. coli are provided as indicated. Numbers in red color denote most frequent codons for which there is no cognate tRNA gene in each organism. Data were were obtained from [7].
