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…
The technique involves intervening in the fertilization process to remove mitochondria, which act as tiny energy-generating batteries inside cells, and which, if faulty, can cause fatal heart problems, liver failure, brain disorders, blindness and muscular dystrophy. “Mitochondrial donation offers a…