My understanding at the moment:  At about the 8-cell stage of development, after fertilization, cells can be pulled from the early being and each cell can be the progenitor of a stem cell line.  Since stem cells can differentiate into different tissues, they are considered a worthwhile resource for tissue rehabilitation.

There is some argument as to the benefit of stem cells from an embryo as compared to umbilical stem cells.  Is the benefit from the destruction of an embryo to obtain a stem cell worthy as compared to umbilical cells which can be harvested without harm to the neonate?

Corrections to my preconceptions are welcome.





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