| FRT variant | 5’ repeat | 8bp central motif | 3’ repeat |
| FRT | gaagttcctattc | tctagaaa | gtataggaacttc |
| F3 | gaagttcctattc | ttcaaata | gtataggaacttc |
| F5 | gaagttcctattc | ttcaaaag | gtataggaacttc |
| F72 | gaagttcctattc | tgtagaaa | gtataggaacttc |
| 14bp addition | gaagttcctattcc |
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