Descriptive Statistics of Human Protein-Coding Exons
| Exons | No. of exons | Length[i] | GC% | % Identity with mouse | |||||
| range | mean | median | overall | third pos. | |||||
| All[iii] | 1219 | 30–1842 | 147 | 123 | 52.1 ± 9.6 | 59.4 ± 19.3 | 86.5 ± 8.0 | ||
| Initial[iv] | 114 | 30–1842 | 222 | 190 | 59.6 ± 10.2 | 72.7 ± 17.0 | |||
| Internal | 991 | 30–624 | 132 | 123 | 51.0 ± 9.1 | 57.5 ± 19.1 | |||
| Terminal[iv] | 114 | 30–1167 | 203 | 190 | 54.5 ± 10.2 | 63.9 ± 18.7 | |||
| Single-exon genes | 25 | 327–4737 | 1376 | 1228 | 56.1 ± 9.6 | 68.2 ± 19.0 | |||
[i] Comparisons of human and mouse sequences often involve insertion/deletion events. Therefore, the alignable length of exons in this study is sometimes smaller than their actual length. However, in the majority of cases (1104 of 1244, or 88%) alignable length is equal to the actual lengths of human and mouse sequences.
[ii] Minimal alignable length was set to 30 bp.
[iii] Excluding single-exon genes.
[iv] Only coding parts of the initial and terminal exons were included.