NPR's Joanne Silberner reports on the birth of a test tube baby intended from birth to help his sister. The sister is six years old and has a rare disease that prevents her from creating her own bone marrow. The disease is treatable by transplanting cells from blood taken from the umbilical cord at birth, but the cells must match or they'll prove troublesome. So a Colorado couple had several embryos created and then selected the one most likely to provide the best transplant. The boy is now five weeks old, and cells from his umbilical cord have been transplanted to his sister.
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