Researchers have two ways they can obtain embryos. The first is by conventional fertilization of an egg with sperm. These kinds of embryos are usually obtained from the surpluses of fertility clinics. When couples are trying to have a baby through in vitro fertilization, they typically end up with far more fertilized embryos than they can use. If they choose, these parents can donate their excess embryos to stem cell research.
The second method for obtaining embryos is therapeutic cloning. In therapeutic cloning, the nucleus from one of the patient's cells is removed and merged with a donor egg, replacing the egg's natural nucleus. That egg is then stimulated with chemicals or electrical energy designed to make it divide and replicate. Since its nucleus (including its genetic material) comes from the patient's own cell, the resulting cells should be accepted by the patient's body.
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