Figure 1

Size distributions of introns and internal exons in plants. The x-axis indicates the size of either introns (A) or internal exons (B). Each number except the last one is labeled with the upper bound (e.g., 100 nt comprises size 51–100 nt). The y-axis indicates the fraction of total introns (A) or internal exons (B) for a given size range of intron or internal exon. The insets show a detailed distribution of smaller (<300 nt) introns (A) or internal exons (B). The bin size is 10, and 100 nt comprises size 91–100 nt for the insets.