What's the history of research on adult stem cells since bush left office?

Exploding: Most current studies are moving to use of adult derived stem cells, which eliminate the controvery and moral issues of destroying embryos. Fat tissue and bone marrow are the most common donor sites, with adult cells that can become bone, cartilage, muscle (incl heart), nerve, pancreas, structural fat grafts, chronic wound healing and graft-vs-host problems (tissue rejection).