Minnesota Public Radio slideshow:
Few couples willing to donate embryos
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Culture trays containing human embryonic stems cells are stored in heat-controlled storage and studied by researchers at the University of Wisconsin's Stem Cell Research lab. (Photo by Jeff Miller, courtesy of the University of Wisconsin-Madison)

Culture trays containing human embryonic stems cells are stored in heat-controlled storage and studied by researchers at the University of Wisconsin's Stem Cell Research lab.

(Photo by Jeff Miller, courtesy of the University of Wisconsin-Madison)
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