Pig embryos that had been injected with human stem cells when they were only a few days old began to grow organs containing human cells, scientists reported on Thursday, an advance that promises — or threatens — to bring closer the routine production of creatures that are part human and part something else.
These human-pig “chimeras” were not allowed to develop past the fetal stage, but the experiment suggests such creations could eventually be used to grow fully human organs for transplant, easing the fatal shortage of organs: 120,000 people in the United States are waiting for lifesaving transplants, but every day two dozen die before they get them.
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