Figure 4. PR2 plot analysis of the four-degenerate synonymous-codon amino acids in D. grandiflorum cp genome.

Alanine, glycine, proline, threonine, valine, arginine (CGA, CGU, CGG, and CGC), leucine (CUA, CUU, CUG, and CUC) and serine (UCA, UCU, UCG, and UCC) were shown in scatter diagrams (A–H), respectively. A₃/(A₃ + T₃): the ratio of A against A + T at the third position of codons. G₃ /(G₃ + C₃): the ratio of G against G + C at the third position of codons. The curves show the center line on 0.5.