1.   And in genetic medicine experiments, harmless viruses are used to carry desirable genes into cells.

2.   Avigen is using a relatively novel, harmless virus called adeno-associated virus, or AAV, as its delivery vehicle.

3.   A few years ago, I was infected by a relatively harmless virus.

4.   Gene therapy works by inserting desired genes into harmless viruses, then allowing the viruses to infect and spread the genes in patients.

5.   In their experiments, researchers found that a human virus normally harmless to mice mutated and became a heart-damaging agent in mice suffering from a nutritional deficiency.

6.   Some variegated plants, however, get their markings because of a harmless virus.

7.   The first is a bacteriophage, a virus harmless to people but lethal to specific strains of bacteria.

8.   These stem cells were removed from the marrow, then infected with a harmless virus that researchers equipped with healthy copies of a crucial immune system gene called ADA.

9.   Fischer took a normal version of that immune system gene and added it to a harmless virus.

10.   The new icon molecule was inserted into a harmless virus that was injected directly into a tumor.