三、 A decade ago, James A. Thomson was the first to isolate human embryonic stem cells. Last week, he announced one of the great scientific breakthroughs since the discovery of DNA: an embryo-free way to produce genetically matched stem cells.
Even a scientist who cares not a whit about the morality of embryo destruction will adopt this technique because it is so simple and powerful.
The embryonic stem cell debate is over. This allows a bit of reflection on the storm that has raged ever since the August 2001 announcement of President Bush's stem cell policy. The verdict is clear: Rarely has a president — so vilified for a moral stance — been so thoroughly vindicated.
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