Scientists hail stem cell research as one of the most promising ways to find treatments for Alzheimer’s disease, juvenile diabetes, cancer and a host of other ailments.   Stem cells can be harvested in five ways. 

1. Embryonic stem cells are harvested from embryos within 7-10 days after fertilization. 
2. Fetal stem cells are harvested from tissue of aborted fetuses.
3. Umbilical cord stem cells are harvested from the blood found in umbilical cord blood. 
4. Placenta derived stem cells are harvested directly from placentas.  
5. Adult stem cells are harvested from certain tissues from which stem cells can be isolated. 

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