FIGURE 2.

Classes of annotated splicing events associated with RNA structures in DA arrangement. The observed proportions are shown relative to the total number of predicted structures corresponding to RefSeq-confirmed splicing events. The expected percentages were computed based on the population proportions for a random sample of the same size. Error bars denote standard errors for proportions (Samuels and Witmer 2003). Types of splicing events (not mutually exclusive) are: alternative (Alt; see Materials and Methods for definition), alternative acceptor site (Acc), alternative donor site (Don), intron-containing internal polyadenylation site (PolyA), intron-containing alternative transcription initiation site (Tx init), intron containing one or multiple cassette exons (Cas Exn).