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Results of conventional HPRT targeting strategies in hTERT transfected fibroblasts
| Vector | Promoter | IRES | Antibiotic | Coloniesr/5 × 106 cells | Targeting events |
| pMK HPRT INEO | None | Yes | NEO | 0 | 0 |
| pMK HPRT IPURO | None | Yes | PURO | 0 | 0 |
| pHPRT+/- | PGK | No | NEO | 282 | 0 |
