1.   Gelsinger died from the treatment in September, in what is believed to be the first death caused directly by gene therapy.

2.   Perhaps gene therapy could prevent the mutation of the prion gene that causes hereditary brain disease.

3.   Scientists have successfully treated the disease using gene therapy.

4.   It is far too early to make sweeping statements about gene therapy.

5.   The problem is that existing gene therapies for many inherited diseases have worked only partially or not at all.

6.   At present, gene therapy is being directed at the working cells in a human body that do not pass on genes to the next generation.

7.   When gene therapy has become a precise procedure, prospective parents will be faced with a wide range of possibilities.

8.   What of germline gene therapy?

9.   There are two types of gene therapy.