Fig. 4From: Codon pair optimization (CPO): a software tool for synthetic gene design based on codon pair bias to improve the expression of recombinant proteins in Pichia pastorisThe usage of synonymous codons in the optimized sequences. The type and number of amino acids appearing no less than 10 times in the optimized sequences were listed. Different colors in the column represent different synonymous codons of the specific amino acids. CUB codon usage bias, CPB codon pair biasBack to article page