Table 1.
Intron correlations within ancient conserved regions (C. elegans sequences excluded)
| Length | (0,0) | (1,1) | (2,2) | Number | χ2 | P |
|---|---|---|---|---|---|---|
| 1 | 1046/934 (12%) | 237/210 (13%) | 165/140 (18%) | 3241 | 41.5 | 1 × 10−6 |
| 2 | 879/779 (12%) | 172/154 (19%) | 115/113 (11%) | 2599 | 32.4 | 1 × 10−4 |
| 3 | 739/656 (13%) | 143/116 (23%) | 84/90 (−6%) | 2105 | 39.8 | 5 × 10−6 |
| 4 | 616/556 (11%) | 111/88 (26%) | 64/69 (−7%) | 1702 | 26.4 | 8 × 10−4 |
| 5 | 486/456 (7%) | 82/71 (15%) | 57/53 (8%) | 1371 | 8.4 | 0.4 |
The data are given for each exon type as observed number/expected number, with the percent excess of observed over expectation in parentheses. The column labeled “Number” lists the total number of exons or of exon sets of the given length. There are 910 ACR regions in this database, and the overall phase bias is 54, 25, and 21% for phases zero, one, and two.