Table 3.
Most frequently found insertion half-sites
| 5′ half-site | Events | 5′ opposite strand | Events | Symmetrical half-sites | Events |
|---|---|---|---|---|---|
| GTTT | 12 | AAAC | 1 | ATAT | 9 |
| GTTG | 11 | CAAC | 4 | GGCC | 7 |
| CATC | 11 | GATG | 3 | AGCT | 6 |
| CCAT | 11 | ATGG | 0 | GATC | 5 |
| GGAT | 10 | ATCC | 9 | AATT | 4 |
| GCTC | 9 | GAGC | 7 | GTAC | 3 |
| GTGT | 8 | ACAC | 3 | CATG | 3 |
| ATTC | 8 | GAAT | 5 | TATA | 2 |
| CTGC | 8 | GCAG | 4 | GCGC | 2 |
| GGGT | 8 | ACCC | 3 | TGCA | 1 |
| GTAT | 8 | ATAC | 1 | CCGG | 0 |
| GCTT | 8 | AAGC | 0 | CGCG | 0 |
| CATT | 8 | AATG | 0 | CTAG | 0 |
| TTAA | 0 | ||||
| TGGA | 0 | ||||
| ACGT | 0 |
As defined in Tables 1 and 2, flanking letters and the central letter are A or T; these were not included in the half-site analysis. Two hundred and fifty-six possible combinations of 4 bases exist. Some of the 4-base possibilities were found frequently, with the leading one being GTTT, as expected from the consensus sequence. Many 4-base sequences were not found even once. Palindromic sequences are shown in the last column of the Table.