Figure 2From: Complex phylogenetic distribution of a non-canonical genetic code in green algaeEstimated ancestral frequencies of glutamine codon usage. Canonical codon CAG is most commonly used, followed by the other canonical codon, CAA. Among the non-canonical codons, TAG is used more commonly then TAA. The estimate ancestral frequencies of non-canonical codon usage along the nodes of interest are indicated with arrows.Back to article page