Rep. Diana DeGette, D-Colo., and Rep. Fred Upton (right), R-Mich., who have spearheaded the 21st Century Cures Act, speak after a 2015 House of Representatives vote in its favor.
Congressional Quarterly/CQ-Roll Call, Inc./Getty Images
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.
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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
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.