Minnesota Public Radio slideshow:
Few couples willing to donate embryos
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A microscopic view of colonies of human embryonic stem cells being studied in a University of Wisconsin research lab. The colonies are the rounded, dense masses of cells. (Photo courtesy of the University of Wisconsin-Madison)

A microscopic view of colonies of human embryonic stem cells being studied in a University of Wisconsin research lab. The colonies are the rounded, dense masses of cells.

(Photo courtesy of the University of Wisconsin-Madison)
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