Figure 3.

Examples of alternatively spliced genes from Entrez Gene at the NCBI. Of the seven classes of alternatively spliced genes, some classes are more likely to indicate annotation problems than others - particularly those genes having one or more sequence-disjoint transcripts. Parts-disjoint transcripts, on the other hand, are more suggestive of complex biology. Alternatively spliced genes having only overlapping transcripts (0:0:N) comprise the vast majority of instances.