Stem cells contaminated with mouse DNA.

Here's the story at The Washington Monthly.

a study released yesterday by researchers at the University of California San Diego and the Salk Institute shows that all the stem cell lines approved by the president are contaminated with mouse DNA

As a result, they're no good for the therapies they're intended to support.

I thought the president's compromise was a pretty good one. I would have preferred fewer limits on this kind of research, but I understood what the guy was trying to do. Now it appears the United States government has taken itself out of the stem cell business entirely.