| In gene therapy, a type of virus known as a retrovirus is used to replace a defective gene in unhealthy cells with a new, healthy gene. Scientists insert the healthy gene into the ribonucleic acid (RNA) of the retroviruses. These retroviruses are mixed with unhealthy cells taken from a patient and cultured in a laboratory. The retroviruses infect the unhealthy cells with the healthy gene, adding the healthy gene to the deoxyribonucleic acid (DNA) of the cells. The cells with the new, healthy gene are then injected back into the patient. |
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