An official website of the United States government, Recalls, Market Withdrawals and Safety Alerts, and the most recent approved product targets a disease caused by mutations in a specific gene. In gene therapy, scientists can do one of several things depending on the problem that is present. The cells are left, to multiply in the laboratory, and are then injected back into the patient, where they continue to multiply and eventually produce the desired effect. Steps of Gene Therapy Step 7: Protein or Hormone Production Step 1: Cell Removal The patients' cells are removed from his or her body. ![]() Before a virus can be used to carry therapeutic genes into human cells, however, it is modified to remove its ability to cause an infectious disease. ![]() Step 2: Virus Alteration Step 6: Cell Injection A virus is altered in a laboratory in order The gene may be inserted through Germ line gene therapy is still an emerging technique that needs to be perfected before being tested on humans. In order to insert new genes directly into cells, scientists use a vehicle called a “vector” which is genetically engineered to deliver the gene.
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