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Thanks Nunya ... Smith is outstanding as always. It's not just that adult stem cells are more efficacious and have experience far greater success, it's that embryonic stem cells have experienced no success and, in fact, have ended up horror stories as experiments went wrong, Parkinson's patients ended up far worse off and bone and hair grew in brain tissue

Even some of the most enthusiastic boosters of embryo stem cell research see trouble ahead. For example, University of Pennsylvania bioethicist Glenn McGee admitted to Technology Review, a Massachusetts Institute of Technology publication,

"The emerging truth in the lab is that pluripotent stem cells are hard to rein in. The potential that they would explode into a cancerous mass after a stem cell transplant might turn out to be the Pandora's box of stem cell research."

Thus, it could be that adult tissue-specific stem cells are actually safer than their counterparts culled from embryos since, being extracted from mature cells, they may not exhibit the propensity for uncontrolled differentiation.

The Politics of Stem Cells (also by Smith, btw)

I think it's important to remember that the one thing at which adult stem cells are NOT as effective as adult stem cells is the nailing open of a window of Non-Personhood wherein human lives may be manufactured like ears of corn for industrial applications.