Oklahoma State Senator Ralph Shortey is being widely mocked for a bill to ban the use of human embryonic tissue in the production or research of food.

FORBES: Biotech's Fear Factor

Doerflinger said his group is in favor of federal funding of research on non-embryonic stem cell lines, using adult tissue, or tissue from fetuses which died of natural causes.

CNN: Bush said to be 'struggling' with stem cell decision

The evidence suggests that umbilical cord stem cells may be even better than embryonic stem cells when it comes to replacing damaged tissue.

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Dalton is a leader in uncovering exactly what it is about embryonic stem cells that allows them to turn into any kind of tissue in the body.

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Researchers highly value embryonic stem cells because of their potential to turn into any organ or tissue cell in the body.

CNN: Obama overturns Bush policy on stem cells

The issue of cloning and embryonic stem cell research intersect when it comes to possible uses of cloned tissue as a source of stem cells.

CNN: House poised to consider human cloning

For the tissue-growing experiment, the researchers focused on the clump of cells containing embryonic stem cells.

WSJ: Experiment Brings Human Cloning One Step Closer

Dr Frisen reckons that they may offer several advantages over human embryonic stem cells which, although easier to manipulate, are a controversial source of new tissue because they are still mainly obtained from aborted fetuses.

ECONOMIST: Stem cells

However, he said that embryonic stem cells remained the most obvious source of cells for such transplants, as foetal tissue - used in some experiments - was scarce, and so-called "adult stem cells" had never been converted into the right type of brain cells, despite 15 years of research.

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