Figure 4.

The percentage of splice events with an orthologue in fish The percentage of splice events in which orthologues of both exons are found in at least one fish species. For insertions, the inserted exons had to be conserved in fish and a sequence without the insertion had to be annotated in a fish species. Tandem exon duplication-derived substitutions (orange) are divided into three groups: ‘internal, homologous’; ‘N-terminal, homologous’ and ‘C-terminal, homologous’ in order to allow comparisons with non-homologous substitutions in equivalent positions (yellow).