[Always Right]

However, they have also attracted controversy because some are extracted from embryos.

Which has proven time and time again to be a waste of time. The real promise is in the adult stem cell research, which Obama CUT.

[agere_contra]

The real promise is in the adult stem cell research

As in this case, of course.

I note the article obfuscates the two, and doesn't make it clear that this particular use is from Adult/umbilical stem cells.