Fig. 3From: Chloroplast gene expression level is negatively correlated with evolutionary rates and selective pressure while positively with codon usage bias in Ophioglossum vulgatum LA plot of the Codon adaptation index (CAI) of the highly expressed genes (the first 20 windows). There were ten codons (in length) in every nonoverlapping windows (beginning with the 5’ end of gene sequences)Back to article page