Researchers at the University of Pittsburgh say they have discovered cells that act like embryonic stem cells but do not require the destruction of the human embryos to harvest them. Amniotic epithelial cells collected from the placenta's amnion after childbirth have the capacity to become cells for other tissues and organs in the body and can make copies of themselves, one expert said. However, they cannot be called stem cells because they do not share stem cells' ability to multiply indefinitely due to a lack of the enzyme telomerase.

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