EXON SUBSETS. “Specific subsets of alternative exons, or “exon networks,” display coordinated regulation between different cell types or conditions. Such exons are often evolutionarily conserved and enriched in genes with related functions, implying that they are involved in important processes or pathway-specific activities. To date, however, the functions of alternative exons within these networks have not been systematically investigated.”
http://www.sciencedirect.com/science/article/pii/S1097276512004820