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Overview of high-frequency codon pairs in Chinese bayberry. 64 codons were put in a clockwise order of 'U’, 'C’, 'A’ and 'G’. Codons encoding the same amino acid or stop codons, as well as the amino acid, are indicated with the same color. The arrows represent high-frequency codon pairs; the direction of arrow is from the preceding codon to the following one, and the arrow colors are the same as for the following codons.
