In this file photo, a professor holds a tray of stem cells at the University of Connecticut. The NIH plans to lift a moratorium on funding studies using human stem cells in animal embryos. Spencer Platt/Getty Images hide caption

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The Chimera Quandary: Is It Ethical To Create Hybrid Embryos?

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Pablo Ross of the University of California, Davis, inserts human stem cells into a pig embryo as part of experiments to create chimeric embryos. Rob Stein/NPR hide caption

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NIH Plans To Lift Ban On Research Funds For Part-Human, Part-Animal Embryos

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Earlier this week, NIH temporarily halted work in the cell therapy lab of Dr. Steven Rosenberg, chief of surgery at the National Cancer Institute, pending a review of safety standards there. Courtesy of National Cancer Institute hide caption

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Task Force Calls For More Safety Oversight At NIH Research Hospital

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The Clinical Center on the campus of the National Institutes of Health, in Bethesda, Md., is an internationally renowned hospital where patients are also research subjects. NIH/Flickr hide caption

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A Fix For Gender-Bias In Animal Research Could Help Humans

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In this Aug. 2014 photo, a chimp sits in a tree at Chimp Haven sanctuary in Keithville, La. Brandon Wade/AP Images for The Humane Society of the United States and Chimp hide caption

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For people 50 and older at a high risk for heart disease or stroke, an aggressive approach to treatment has advantages. But there are risks, too. iStockphoto hide caption

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Human stem cells, in this case made from adult skin cells, can give rise to any sort of human cell. Some scientists would like to insert such cells into nonhuman, animal embryos, in hopes of one day growing human organs for transplantation. Science Source hide caption

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Should Human Stem Cells Be Used To Make Partly Human Chimeras?

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National Institutes of Health funding has been flat for years. iStockphoto hide caption

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Bill To Boost Medical Research Comes With A Catch

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Glenn Lightner in 2012 at age 13. His father searched clinicaltrials.gov for years, to no avail, hoping to find a promising experimental cancer treatment that might save his son's life. Courtesy of Lawrence Lightner hide caption

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Results Of Many Clinical Trials Not Being Reported

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Truvada can dramatically reduce the risk of HIV infection when taken as a preventative medicine — if taken every day. Studies are underway to determine if young people are likely to take the pill consistently. Justin Sullivan/Getty Images hide caption

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Would A Pill To Protect Teens From HIV Make Them Feel Invincible?

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