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21 November 2011

When does pregnancy begin?

Though most doctors can give a definition of when pregnancy begins, it's not always the same one, according to a new survey.

Though most doctors can give a definition of when pregnancy begins, it's not always the same one, according to a new survey.

The definition of pregnancy can have a major impact on law and policy.  For example, embryonic stem cells are often derived from surplus embryos that aren't implanted into a woman after in vitro fertilizations.

 
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