Oddly enough it seems all the big discoveries seem to come from NON-embryonic stem cells.
Potential reasons for this:1/ Embryonic stem cells are not as good for medical purposes
2/ Adult stem cells have been researched longer and therefore the technology is more mature and closer to market
3/ Due to government discouragement of embryonic stem cell research things are progressing slower in that field.
4/
Patents that claimed to cover all embryonic stem cell research have elevated costs and made it questionable whether people can legally do research on embryonic stem cells.
There could be other reasons of course.