Table 1. Characteristics of type 0, UHP, and DHP exons.

The values for genes that had both exon types were counted for both types of exons.

Feature	type 0	UHP	DHP	0 vs. UHP	0 vs. DHP	UHP vs. DHP
exons per genea	11	13	14	2.1 × 10−12	1.7 × 10−14	6.7 × 10−1
transcripts per genea	14	13	12	7.7 × 10−24	1.5 × 10−76	1.06 × 10−10
inclusion in proportion of transcriptsa	9%	24.1%	20%	2.2 × 10−308	1.2 × 10−280	2.4 × 10−4
upstream intron lengtha	584 bp	930 bp	832 bp	1.6 × 10−30	8.4 × 10−17	0.03
downstream intron lengtha	587 bp	932 bp	613 bp	9.8 × 10−23	1.3 × 10−1	3.9 × 10−14
exon lengtha	142 bp	135 bp	158 bp	0.03	1.9 × 10−32	7.9 × 10−25

^a)Mann-Whitney test.