Classification of inter-exonic connections as splicing patterns. Four component splicing patterns have been defined, depending on connections between distinct exons (black) and variant exons (blue). Class I refers to connections between two successive distinct exons while Class IV refers to connections between two successive variant exons. Classes II and III depict connections between a distinct exon and a variant exon.
Chacko and Ranganathan BMC Genomics 2009 10(Suppl 1):S5 doi:10.1186/1471-2164-10-S1-S5