Human Embryonic Stem Cells Developed From 4-cell Embryo; World First May Lessen Ethical Concerns

For the first time in the world scientists have succeeded in developing human embryonic stem cells from a single cell, or blastomere, of a 4-cell stage embryo. The scientists said that their research meant that it might be possible in the future to produce hESC lines at an earlier stage without destroying the embryo.

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