FIG 4.

Large-scale DNA and RNA alternative splicing. (A) Cryptically excised IESs in contig 8469. Repetitive segments (each one is 7 bp) are shown in the same color. The length differences between each pair of jointly used segments are shown beside each segment. (B) Length distribution of introns, using bin size of 2 bp. (C) Patterns of nucleotide usage for the 10-bp segment internal to both ends of introns. (D) Distribution of introns in all single-gene coding chromosomes of Halteria grandinella and Oxytricha trifallax. Window size is 1% of the whole chromosome without two telomeres.