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What is the source of embryos used for making embryonic stem cells?

April 26, 2017embryonic stem cells Embryos source Used

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What is the source of embryos used for making embryonic stem cells?

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The human embryonic stem cell lines that have been created at Harvard are derived from frozen embryos left over after in vitro fertilization (IVF) treatment. These early stage embryos were donated, with informed consent, by patients who had completed their treatment. In the future, Harvard researchers also hope to derive embryonic stem cells by somatic cell nuclear transfer.