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I should like to make a little progress, then I will certainly give way to the hon. Gentleman.
Some scientists claim that the use of adult stem cells will not involve the complications that could arise with embryonic stem cells. As long ago as February this year, a paper in Science magazine made it clear that adult stem cells could be easier to manage and, if transplanted to their normal environment—for example, brain cells into brain tissue—would produce only the cell types necessary for that tissue. Perhaps that is not so flexible as embryo stem cell methods, but it is probably more effective.