A young Minnesota girl named Molly Nash is doing well, after receiving a transplant of cells from her baby brother. Her brother was created by in vitro fertilization, because her parents wanted a child who could serve as a cell donor to combat Molly's anemia. As ethicists wrestle with questions about this procedure, the University of Minnesota is moving ahead to help other families in the same way. NPR's Joanne Silberner has a report.
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