A House-passed stem cell research bill, allowing the use of federal funds for new lines of stem cells, is drawing fiery exchanges between opponents and proponents. The debate focuses on whether easily-harvested adult stem cells could prove as promising as embryonic cells that only can come from destroyed embryos. Three scientific proponents wrote a letter to the journal Science and, point-by-point, explained that the conclusions reached by a conservative scientist who had said adult stem cells had as much potential as embryonic ones were wrong.

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