Table 2.
Distribution of the most abundant MSs in the different databases.
| Unit | Non-masked | tRNA SINEs | Other repeats | Total | P-valuea |
| A | 14 | 24 | 11 | 49 | 0.0179 |
| C | 4 | 0 | 4 | 8 | 0.0590 |
| AC | 476 | 221* | 285 | 982 | <.0001 |
| AG | 45 | 141* | 28 | 214 | <.0001 |
| AT | 7 | 6 | 5 | 18 | >.9999 |
| CG | 6 | 0 | 2 | 8 | 0.0590 |
| AAC | 5 | 11 | 11 | 27 | 0.4108 |
| AAG | 2 | 6 | 2 | 10 | 0.0896 |
| ACC | 4 | 0 | 5 | 9 | 0.0349 |
| AGC | 6 | 0 | 2 | 8 | 0.0590 |
| AGG | 4 | 8 | 0 | 12 | 0.0250 |
| AAAC | 6 | 9 | 2 | 17 | 0.1157 |
| AAAG | 19 | 19 | 16 | 54 | 0.7686 |
| AAAT | 3 | 57* | 6 | 66 | <.0001 |
| AAGG | 13 | 5 | 16 | 34 | 0.0256 |
| ACAG | 4 | 0 | 5 | 9 | 0.0349 |
| ACAT | 2 | 3 | 2 | 7 | 0.6901 |
| ACGC | 4 | 0 | 2 | 6 | 0.1863 |
| AGAT | 13 | 9 | 19 | 41 | 0.1772 |
| AGGG | 4 | 4 | 0 | 8 | 0.4509 |
| ATCC | 8 | 0 | 3 | 11 | 0.0201 |
| AAAAC | 6 | 6 | 1 | 13 | 0.3747 |
| AAAAT | 1 | 6 | 1 | 8 | 0.0180 |
| ACACC | 3 | 0 | 3 | 6 | 0.1863 |
| Others | 25 | 22 | 23 | 70 | 0.8968 |
| Total | 684 | 557 | 454 | 1695 |
aFisher's exact test for comparisons between specific motifs in tRNA SINE and the combined values of the other two databases. Repeat motif frequencies which have a significant departure compared to Bonferroni-corrected alpha for 25 comparisons (P-value < .002) are indicated with an asterisk (*).