Therapeutic cloning is the process of creating multiple copies of a cell to treat a disease. In this type of cloning, the nucleus of a cell, such as a skin cell, is inserted into a fertilized egg whose nucleus has been removed. The nucleated egg begins to divide repeatedly to form a blastocyst. Stem cells are then extracted from the blastocyst and they are used to grow cells that are a perfect genetic match for the patient. The cells created through therapeutic cloning can then be transplanted into the patient to treat a disease from which the patient suffers.