Fig. 2

Comparison of base composition of coding sequences of single-exon genes and multiple-exon genes in rice. Here, A3s, T3s, C3s, or G3s is the frequency that codons have an A, T, C, or G at their synonymous third position, relative to the amino acids that could have a synonym with A, T, C, or G in the synonymous third codon position. GC1, GC2, or GC3 is the percentage of GC content at the first, second, and third codon position, respectively