Figure 4
From: Conserved and species-specific alternative splicing in mammalian genomes
Fraction of intron-extending donor splice sites. Horizontal axis: intron length. Vertical axis: fraction of intron-extending donor sites among all alternative donor sites in introns of the given length. The three panels represent functional types of alternative splicing events. Left: frame-shifting or rarely used sites. Middle: frequent, frame-preserving alternative sites. Right: frequent alternative sites conserved in either mouse or dog