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Adult stem cells are also problematic, as they are difficult to identify, purify and grow, and simply may not exist for certain diseased tissues that need to be replaced.

The choice is not between conducting the stem cell research or not conducting it. That is not the choice.

More important is the fact that embryonic stem cell research could lead to new treatments and cures for the many Americans afflicted with life-threatening and debilitating diseases.

Stem cells are probably going to be extremely useful.

We have a responsibility to promote stem cell research which could lead to treatments and cures for diseases affecting millions of Americans.

In Britain, like most of the developed world, stem-cell research is regarded as a great opportunity. America will be left behind if it doesn't change policy.

Laura Bush went on national television during the week of my father's funeral and spoke out against embryonic stem cell research, pointing out that where Alzheimer's is concerned, we don't have proof that stem-cell treatment would be effective.

In fact, many nations currently refuse to support embryonic stem cell research of any kind.

Stem cell research can revolutionize medicine, more than anything since antibiotics.

I think that we're foolhardy to not be engaging in federal funding of stem-cell research in the most aggressive way we possibly can.