This microscopic image shows human induced pluripotent stem cells, colored red, integrated into a pig embryo. Scientists hope these human cells can be harnessed to create organs for transplant patients one day.
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Juan Carlos Izpisua Belmonte, background, and colleague Ju Wu are leading this international research.
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Pigs at the Agropor facility in Spain are being used in the chimera experiments.
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In this human-mouse chimeric embryo, the human stem cells are shown in green and mouse cells are blue. Early in the research, scientists focused on integrating human cells into mouse embryos. However, pigs are now a preferred animal because their organs are roughly the same size as humans'.
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New induced pluripotent stem cells from an adult human's skin and hair are being grown in a culture dish.
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Researchers at Agropor field laboratory in Spain are collaborating with some American universities in chimera research.
