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Examples of LTRs exapted as regulatory elements in human and mouse and their classification.
| Species | ERV Class | ERV Family | Examples of LTR Subtypes |
|---|---|---|---|
| Mouse | I | ERV1 | LTR17 |
| I | ERV3 | MER77 | |
| II | ERVK | LTR10C, LTR10B, LTR13D5, BGLII | |
| III | MaLR | MT-A, MT-B, MT-C, ORR1A0 | |
| III | ERVL | MT2, MT2B, MT2C | |
| Humans | I | ERV1 | LTR7, MER39, MER41, LTR12C |
| I | ERV3 | MER21C | |
| I | ERV9 | LTR9 | |
| II | ERVK | LTR5 | |
| II | ERVK3 | LTR3B | |
| II | ERVK14 | LTR14B | |
| III | MaLR | THE1A, THE1B, THE1C, MER39 | |
| III | ERVL | MLT2A1, MLT2B3, LTR16A | |
