They argue that using adult stem cells culled from patients would suffice, though many biologists disagree.
We got off track in America because adult stem cells are confused with embryonic stem cells.
But they are easier to use, and probably could treat more diseases than so-called adult stem cells.
But as Paul Knoepfler notes, recent research suggests adult stem cells should be viewed with more caution.
FORBES: Researchers Highlight Warning Signs On Adult Stem Cell Treatments
Scientists at Edinburgh University took adult stem cells from mouse brains and marked them with a fluorescent tag.
She pointed out that other research teams in Australia and Portugal were developing spinal therapies using adult stem cells.
Patel has pioneered the use of adult stem cells to treat heart disease.
They said research using adult stem cells, the field each of them works in, has more potential to help patients.
Dr Cheng said the results clearly showed there was no advantage in using adult stem cells over mature fully differentiated cells.
More than 90 percent of research on using stem cells to repair the human heart involves adult stem cells, Lee said.
This is true whether they use so-called adult stem cells, as Osiris Therapeutics and Cytori do, or the embryonic kind, like Geron.
Adult stem cells have great potential as cell sources for regenerative medicine.
Memorial Sloan-Kettering's Studer spent years trying to transform adult stem cells into neurons to study why they die off prematurely in Parkinson's disease.
More and more clinics around the country are offering stem cell transplants using adult stem cells to treat an ever growing list of ailments.
FORBES: Researchers Highlight Warning Signs On Adult Stem Cell Treatments
Like embryonic stem cells, these new adult stem cells will divide again and again without appearing to age if cultured in the right conditions.
The malaise has extended to companies working with less ethically questionable adult stem cells, which, unlike embryonic stem cells, don't require the destruction of embryos.
He said the aim now would be to look at adult stem cells to see if they could be genetically altered to behave like the mouse retinal cells.
Curis, a firm based in Cambridge, Massachusetts, is building complex organs out of adult stem cells and testing them in patients with serious organ defects, such as bladder failure.
To be sure, the papers cited are just three studies over the past year and cannot be taken as evidence that there is anything fundamentally wrong with adult stem cells.
FORBES: Researchers Highlight Warning Signs On Adult Stem Cell Treatments
But it is not yet known whether tissues derived from embryonic stem cells would cause transplant rejection, whereas this does not seem to be a problem with adult stem cells.
But Dr. Robin Lovell-Badge, the head of the UK's National Institute of Medical Research, told CNN that the use of embryonic cells had huge advantages over using adult stem cells.
Some of the top American researchers who specialize in both embryonic and reprogrammed adult stem cells were scheduled to present, and no doubt this had the more conservative elements in fits.
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In 2003, the AHA accepted a paper from Brazil, proving absolutely that Adult Stem Cells (ASC) could improve and save the lives of the worst kind of heart patients: transplant candidates.
Is this true, or are adult stem cells and cord cells in fact viable alternatives that avoid the moral controversies that are at the core of the embryonic stem cell debate?
Lott's comments echo those of three House GOP leaders who last week wrote Bush urging him to block federal funding for research using human embryos and instead focus on adult stem cells.
CNN: Lott says he's opposed to federal funding of stem-cell research
"There are currently 58 diseases that are being treated using adult stem cells so the issue of stems cells has a positive side, providing the cells are obtained ethically, " Quintavalle told CNN.
Defenders of embryonic stem cell work say that it is important even in understand adult stem cells and induced pluripotent stem cells, which resemble the embryonic cells but can be created without destroying embryos.
Outside the U.S., adult stem cells have been used to treat patients with Type 2 diabetes in Argentina, heart disease in countries including Germany, Thailand and India, and babies with malformed hearts in Japan.
Osiris Therapeutics of Baltimore has several trials under way using adult stem cells to treat the intestinal inflammation known as Crohn's disease, repair damaged tissue following a heart attack and prevent the progression of arthritis.
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