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St. Paul, Minn.

The ethics of embryonic modification

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Human embryos
Embryologist Ric Ross examines a dish with human embryos under a microscope at the La Jolla IVF Clinic February 28, 2007 in La Jolla, California.
Photo by Sandy Huffaker/Getty Images
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Human embryos
Embryologist Ric Ross examines a dish with human embryos under a microscope at the La Jolla IVF Clinic February 28, 2007 in La Jolla, California.
Photo by Sandy Huffaker/Getty Images