Figure 2From: The action of selection on codon bias in the human genome is related to frequency, complexity, and chronology of amino acidsRMCU (vertical axis) of amino acids in Group B vs. breadth of expression. The bins on the horizontal axis represent breadth of expression as follows: bin 1: 1–5, bin 2: 6–9, bin 3: 10–13 and bin 4: 14–20.Back to article page