Table 3. Six consistent patterns of differential usage were identified.

Cat.	Name	Count	Representative genes
1	Cassette exon	27	CDKN2A, KLK12, FAM64A
2	Outliers	67	APRT, RABAC1, TSPO
3	Differential use of 5′- exons	50	SPATA21, SMN1, CKMT1A
4	Differential use of 3′- exons	15	RPL22L1, CRHR1, ECE2
5	Alternative start sites	53	RPS8, RPL7A, RPL35A
6	Likely mapping artifacts	110	S100A7, HLA-DRB1, RPL27