1.   There, the missing gene will be added to the marrow by infecting it with a genetically altered virus.

2.   In addition, the gene therapy institute will stop manufacturing the genetically altered viruses, known as vectors, that are used to introduce genes into cells.

3.   Gillespie said the studies showed that the altered virus attacks only brain cells that are dividing or growing.

4.   The altered virus was injected into the brains of aged monkeys.

5.   The researchers than injected the altered virus into the abdomen of Aedes aegypti, the type of mosquitoes that can carry the dengue fever virus.

6.   When it was injected into mouse muscle, the altered virus quickly infected nearby cells, delivering the growth factor gene but causing no other infection.

7.   While the mosquitoes were asleep, the researchers used the minute needles to inject one micro liter of the altered virus into their abdomens.

8.   An experimental treatment for cancer using a genetically altered virus seems to be an efficient cure for certain strains of cancer, a group of researchers reported Wednesday.