Yahoo health: Blood Stem Cells Originate in the Placenta (HealthDay)

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Blood Stem Cells Originate in the Placenta (HealthDay)

HealthDay - FRIDAY, March 7 (HealthDay News) -- Blood stem cells, which later
differentiate into all types of blood cells, originate and are nurtured in
the placenta, a U.S. study finds.

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