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Bob, I am not a scientist, but I have heard scientists say that embryonic stem cells are preferable for research because the researchers need to observe them as they mature from embryonic to adult. Knowing what happens during that process will aid in determining how the cells can be used to regenerate tissue. Apparently, embryonic stem cells can become any type of tissue (neural, muscle, bone, etc.). Adult stem cells have already taken on certain characteristics which limit what type of tissue they can become. Rees Jenkins ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn