The Human Embryonic Stem Cell Research Advisory Committee updated a 2005 report in light of recent breakthroughs that could allow scientists to make stem cells without using human embryos. The panel, however, said human embryonic stem cells are still necessary for research because the usefulness of stem cells from new sources, or induced pluripotent stem cells, remains unproven. The panel called for regulations on these stem cells, especially if they are used in animal research.

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