Identification and evolutionary analysis of novel exons and alternative splicing events using cross-species EST-to-genome comparisons in human, mouse and rat

Table 2 Properties of ENACE CDS exons (including 6 ENACE identifications).

Cassette-on exons
No. of exons identified	692
Average length (bp)	86
Median length (bp)	63
Average number of supporting ESTs	1.3
Average sequence identity with the counterpart (%)	89
Retained introns
No. of exons identified	66
Average length (bp)	766
Average length of retained intron (bp)	115
Average number of supporting ESTs	1.1
Average sequence identity with the counterpart (%)	86
No. of initial exons¹	17
No. of terminal exons²	19
No. of single-exon transcripts³	6

The retained introns connect ¹ the first and the second (or ² the last and the second last) coding exons of the original transcripts. ³ The retained introns connect the exons of originally two-exon transcripts to make single-exon transcripts.

ISSN: 1471-2105