De Rooij called the new study "a breakthrough."
"In comparison to the mouse studies that have been done, there is a big leap forward in efficiency with which these people get these germline stem cells," he said.
But besides the obvious fact that women can't benefit from this development, Donovan, who called the study "an exciting piece of work," raised one additional question that may limit the technique's adoption: "I suspect people would be much more willing to give up a piece of skin to make an iPS cell than to have a testicular biopsy to give rise to an adult germline stem cell," he said.
For more on stem cells, visit the U.S. National Institutes of Health.
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