Abstract
The first two human embryonic stem cell lines (VAL-1 and VAL-2) have been derived in Spain with long-term cryopreserved embryos under animal-free conditions. In the first series, 40 human embryos that had been cryopreserved at day 2 of development were thawed after >5 years. A derivation efficiency of 5% per frozen embryo or 12.5% per blastocyst was obtained.
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