Supplement Information 11
Exon variation in transcripts of alternative splice clusters
Constitutive	Invariant exons	Length variation exons			Total length variation exons	Total variant exons
		5' variants	3' variants	3' & 5' variants
5'UTR	4,057	210	288	2	500	500
CDS	36,639	1,109	770	17	1,896	1,896
3'UTR	2,546	74	56	4	134	134
subtotal	43,242	1,393	1,114	23	2,530	2,530
Cryptic internal
5'UTR	459	20	9	1	30	489
CDS	2,643	73	52	7	132	2,775
3'UTR	114	5	5	0	10	124
subtotal	3,216	98	66	8	172	3,388
Cryptic terminal
5'UTR	814	0	40	1	41	855
CDS	1,490	44	42	0	86	1,576
3'UTR	140	9	2	0	11	151
subtotal	2,444	53	84	1	138	2,582
Total variant exons	5,660	1,544	1,264	32	2,840	8,500