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Ethical dilemmas have stunted the pursuit of stem cells' heady promise because the cells are derived from week-old embryos. Using traditional methods, the embryos are destroyed. Some critics say the process is tantamount to murder, and call the research immoral. In a study published Thursday in Cell Stem Cell, Wake Forest University Institute for Regenerative Medicine researchers plucked single cells from two-day-old human embryos without harming them, then transformed them into embryonic stem cells, also known as ESCs.
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