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Origin of clones conserved in all three species.
| Bovine oocyte library | Mouse oocyte library | Xenopus oocyte library | Total | |
| Conserved in all three species | 718 | 476 | 347 | 1541 |
| Conserved in all three species and preferentially expressed in oocyte | 120 | 96 | 52 | 268 |
