Figure 2From: Codon usage is associated with the evolutionary age of genes in metazoan genomesAge-dependent codon usages for representative codons. The age dependent codon usages for the arginine (top), threonine (middle), and cysteine (bottom) codons for the mouse and human genes are shown. In the right column, the codon usages for these amino acids after a random reshuffling of the age assignments for the human genes are shown. See Figure 1 for the definition of the age groups used.Back to article page