Researchers Wait For Federal Guidelines Two reports, one from each side of the Atlantic Ocean, conclude that research on xenotransplantation-the transfer of organs, tissues, or cells from animals to humans-should be pursued because the potential benefits of the practice outweigh its possible risks. But scientists in the United States are frustrated by the Public Health Service's slow pace in issuing federal guidelines for the research.

CAUTIOUS STEPS: Xenotransplantation pioneer Suzanne Ilstad says scientists must proceed carefully.
Meanwhile, some critics of xenotransplantation say that not enough attention is being paid to the chance of disease transmission from animals to humans. And animal-welfare activists are concerned that xenotransplantation may provide an entirely new arena for animal exploitation.

The two reports come from the Institute of Medicine (IOM) in the U.S. and the Nuffield Council on Bioethics in the United Kingdom. IOM, a private, nonprofit organization that provides health policy advice under...

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