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. 2020 Aug 5;215(3):531–568. doi: 10.1534/genetics.119.301807

Figure 6.

Figure 6

Schematic representations of elementary alternative splicing events. (A) Cassette exon. (B and C) Competitive 5′- (B) and 3′- (C) splice sites. (D) Mutually exclusive exons. (E) Retained intron. (F) Back splicing. (G) Alternative first exons. The first exon of an mRNA is selected by alternative promoters. TSS, transcription start site. (H) Alternative last exons. The last exon of an mRNA is selected in conjunction with alternative polyadenylation sites. CPS, cleavage and polyadenylation site.