Fig. 4.

GC₃ distribution in oil palm gene models. a GC (red) and GC₃ (blue) composition of coding regions of E. guineensis. b Genome signature for GC₃-rich and -poor genes. c GC₃ gradient along the open reading frames of GC₃-rich and -poor genes. d CG₃ skew gradient along the open reading frames of GC₃-rich and -poor genes. Figures c and d: x-axis is number of codons in coding sequence. Figure d: C₃ and G₃ is frequency of cytosine or guanine in third position of codon. CG₃ is frequency of cytosine and guanine in third position of codon