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- Are derived from embryos. Specifically, embryonic stem cells are derived
from embryos that develop from eggs that have been fertilized in vitro, in
an in vitro fertilization clinic, and then donated for research purposes
with informed consent of the donors. They are not derived from eggs
fertilized in a woman's body. The embryos from which human embryonic
stem cells are derived are typically four or five days old and are a
hollow microscopic ball of cells called the blastocyst.
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Notas
