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when are they used?
Question from wondering on 11/3/2009:

How many days or weeks old is a human embryo when HE or SHE is used for embryonic stem cell research?

Answer by Judie Brown on 11/4/2009:

Dear Wondereing

Four days old is the average age of the human being used for human embryonic stem cell research.

Judie Brown

COPYRIGHT 2009

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