Table 2. Observed and expected frequencies of residues of different solvent accessibilities (exposed, half-buried, and buried) that are mapped to the boundaries of alternative splicing events.
| Splicing event | Solvent accessibility | Observed (expected) | χ2 |
|---|---|---|---|
| Insertion | Exposed | 38 (28) | 3.79 |
| Half-buried | 23 (23) | 0.00 | |
| Buried | 8 (18) | 5.69 | |
| Deletion | Exposed | 471 (355) | 37.53 |
| Half-buried | 258 (296) | 4.82 | |
| Buried | 155 (233) | 25.97 | |
| Substitution | Exposed | 355 (301) | 9.76 |
| Half-buried | 253 (250) | 0.03 | |
| Buried | 140 (197) | 16.46 |
Statistical significances of observed differences were calculated with χ2 distribution with four degrees of freedom. Statistically significant differences are highlighted in bold (P < 0.001).