U.S. scientists who worked on pig fetuses injected with stem cells derived from human umbilical cord blood and bone marrow found that the cells developed into a diverse range of human T cells -- important elements of the immune system -- after the animals were born. The study also found that the cells did not launch an immune attack when combined with normal cells from the donor of the stem cells. The piglets could be used to cultivate immune cells that combat certain diseases, the lead researcher said.

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