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Long-term Viability of cord blood stem cells stored at -20°C after cryopreservation The viability of cord blood stem cells maintained at -20 °C after cryopreservation was examined immediately after thawing.
| Cryoprotectant Medium | Percentage Viability |
| Medium–1. | 66.0±4.4 |
| Medium–2. | 83±4.6 |
| Medium--3 | 46.6±3.6 |
