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A groundbreaking discovery two years ago that turned ordinary skin cells back into an embryonic or “pluripotent” state was hailed as the solution to the controversial ethical question that has plagued stem-cell science for the past decade.

But is it the solution? Or have iPS cells (induced pluripotent stem cells) simply added a new dimension to the legal, social and ethical debates that are an important and necessary part of stem-cell advances.

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