Fig. 3
From: Comparative and evolutionary analysis of chloroplast genomes from five rare Styrax species
Relative synonymous codon usage and selective pressures in the evolution. (A). Codon content of 20 amino acids and stop codons in all protein-coding genes of five chloroplast genome; (B). Distribution of codon preference in five species; (C). Ka/Ks values of protein-coding genes of the five comparative combinations. Note: in (A), the top panels show the RSCU for the corresponding amino acids, and the colored blocks shown below represent different codons; In (C). Ka: nonsynonymous; Ks: synonymous