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> How about “Endothelial cells derived from human embryonic stem cells form durable blood vessels in vivo”?

I am assuming that you did not actually read the article. This kind of publication is known as a “brief communication”, which means that while the results being reported are very exciting, they are preliminary. For example, there is no information whether any of the mice developed cancers.

Interestingly, Dr. Scadden, who was the senior author on this publication (the web site you referenced messed up the order of the authors), had a Newsweek article where he is very upbeat about the potential of induced pluripotent stem cells (iPS), which are a type of adult stem cell.

Oh, okay...lol. Well, I suppose the New World didn't actually exist until Columbus brought back things from it, eh? Sorry, but science often operates incrementally and if you are going to play games with the wording to keep backing away from statements, then we could have done the same with adult stem cell research.

Interestingly, Dr. Scadden, who was the senior author on this publication (the web site you referenced messed up the order of the authors),

You're right, it did...that's bizarre. Sorry for posting that one instead of the actual publication link. Actal citation is:

Wang ZZ, Au P, Chen T, Shao Y, Daheron LM, Bai H, Arzigian M, Fukumura D, Jain RK, Scadden DT. "Endothelial cells derived from human embryonic stem cells form durable blood vessels in vivo." Nat Biotechnol. 2007 Mar; 25(3):317-8. Epub 2007 Feb 25. doi:10.1038/nbt1287

[...] he is very upbeat about the potential of induced pluripotent stem cells (iPS), which are a type of adult stem cell.

...as am I. I hope you realize that one path of research does not preclude the other. In fact, the results of embryonic stem cell research has led to advances in adult stem cell research, and we might find different uses for the two sources.