Truncation[i] of “Heads” in Alu Pairs According to Orientation and Distance
| Orientation of pairs | Separation distance (b + c) (bp) | Frequency | |||
| internal truncation % | external truncation % | no truncation[ii] % | total no. | ||
| Direct Repeats | |||||
| CC | 0–20 | 39.8 | 4.2 | 55.9 | 10170 |
| 21–40 | 36.3 | 17.8 | 45.9 | 3541 | |
| 41–60 | 34.4 | 26.8 | 38.8 | 2242 | |
| 61–80 | 27.0 | 31.5 | 41.5 | 1962 | |
| 81–100 | 24.4 | 39.2 | 36.3 | 1923 | |
| 101–120 | 24.8 | 35.3 | 40.0 | 1655 | |
| Inverted Repeats | |||||
| CD | 0–20 | 50.0 | N/A | 50.0 | 66 |
| 21–40 | 13.8 | N/A | 86.2 | 747 | |
| 41–60 | 28.4 | N/A | 71.6 | 524 | |
| 61–80 | 36.2 | N/A | 63.8 | 525 | |
| 81–100 | 38.3 | N/A | 61.7 | 468 | |
| 101–120 | 50.8 | N/A | 49.2 | 496 | |
| DC | 0–20 | N/A | 56.4 | 43.6 | 280 |
| 21–40 | N/A | 48.9 | 51.1 | 485 | |
| 41–60 | N/A | 47.4 | 52.6 | 490 | |
| 61–80 | N/A | 46.4 | 53.6 | 455 | |
| 81–100 | N/A | 45.2 | 54.8 | 423 | |
| 101–120 | N/A | 48.6 | 51.4 | 449 | |
[i] Truncations are ≥5 bp
[ii] Includes truncation ≤5 bp