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. 2013 Jan 19;11(1):41–55. doi: 10.1016/j.gpb.2013.01.001

Figure 4.

Figure 4

Codon usage plots based on fixed background GC and purine contents Purine contents (R) are set from 0.4 to 0.6 (color-coded; red for R = 0.4, green for R = 0.45, yellow for R = 0.5, cyan for R = 0.55, purple for R = 0.6). The genetic code is grouped into four quarters with each having 16 codons including AT-rich quarter (A), GCp1 quarter (B), GCp2 quarter (C), and GC-rich quarter (D). The scattering of the curves indicates sensitivity to purine variation in a context of GC content increase. Data from each bacterial genome is represented as a single solid circle.