Table 2.

Novel alternative splicing (AS) events identified in Ensembl genes (ENSGs) and novel transcript clusters (NTCs). Exons are categorized according to the type of AS events.

Alternative splicing events	SE*	RI†	A5E‡	A3E§	MXE∥
Original novel exons in ENSG	968	691	268	332	15
% of total (1,873)	52%	37%	14%	18%	< 1%
Updated novel exons in ENSG	623	629	197	235	8
% of total (1,384)	45%	45%	14%	17%	< 1%
Novel AS exons in NTCs	223	0	138	109	7
% of total (421)	53%	0	33%	26%	1%

“Original”: novel exons identified relative to Ensembl v56. “Updated”: novel exons identified relative to the most recent databases including Ensembl v61, UCSC KnownGenes and RefSeq genes. Note that one exon may be associated with multiple types of AS. Such exons are counted into all applicable types. (Thus, the % values for all categories may not sum to 100%.)

^*SE: Skipped exon

^†RI: Retained intron

^‡A5E: Alternative 5' splice site exon

^§A3E: Alternative 3' splice site exon

^∥MXE: Mutually exclusive exon