Gene therapy is a perennial hot-button issue in today's news cycle. This relatively new and experimental field involves inserting genetically altered genes into cells to replace defective genes. It can treat genetic disorders or provide a specialized disease-fighting function. The multifaceted topics surrounding gene therapy--DNA, techniques, challenges, and risks--are presented in this clear, understandable text, so that readers can grasp the ramifications and ethical concerns of this incredible technology. While gene therapy is currently only being tested for the treatment of diseases that have no cures, genetic engineering for many ailments and conditions is a very real possibility of the near future.