Scientists are unsure if stem cells are altered for the worse when grown in the lab.
Most researchers agree that one day they will supplant embryonic stem cells in the lab.
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"We select out the unwanted cell types to achieve pure stem cells, " explains Kraus.
The cause appears to be the culture media in which the stem cells are grown.
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Those errors will be there in any stem cells and tissues produced by cloning.
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For the tissue-growing experiment, the researchers focused on the clump of cells containing embryonic stem cells.
But the question is going to come later on, to who actually owns these stem cells?
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We wrote about stem cells and politics, about genomics, about heart disease.
A. One common misconception is that stem cells are being currently used to cure diseases.
When implanted in mice, just a few hundred of these stem cells generated a massive tumor.
They argue that using adult stem cells culled from patients would suffice, though many biologists disagree.
What of the argument that stem cells harvested from adults offer plenty of opportunity for research?
We got off track in America because adult stem cells are confused with embryonic stem cells.
Some researchers predict that stem cells eventually will be found in most major types of cancer.
The concept that stem cells run-amok may fuel cancer's spread was first proposed in the 1960s.
The ultimate treatment might be using healthy stem cells to replace damaged cells in the macula.
Beachy's work had given rise to experimental medicines that blocked these stem cells' growth.
But those very viruses probably make these new embryonic stem cells useless as treatments.
Initially Grove was enthusiastic about the potential of embryonic stem cells as a treatment.
Stem cells may someday solve the problem, but that science is still in its infancy.
The stem cells were given physical or chemical cues to create the desired type, Green said.
The world's first official trial using human embryonic stem cells in patients has been halted.
They may also produce growth factors that attract new stem cells to the heart.
One challenge with embryonic stem cells, however, is preventing them from creating tumor cells.
Geron wants to inject embryonic stem cells direct into the spine of newly paralysed patients.
These are the same four genes that seemed to be very active in embryonic stem cells.
Some stem cells, including those for the heart, lung and kidney, cannot be found in adults.
And activating calcineurin could potentially enable scientists to direct embryonic stem cells to become insulin-producing cells.
Such versatility means that stem cells offer a new way of regenerating damaged tissues.
Inside the body, and out, there is no shortage of jobs for stem cells.
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