And T cells happen to be the body's best line of defense against cancer.
But without T cells, the patients often get serious infections or cancer.
This then causes the immune system's T cells to kill them off.
When the mice got T cells alone as a treatment, there was no effect on the virus, they said.
The problem is that this can also affect other T cells, not just the ones aimed at the skin.
But what starts the T cells on their misguided mission?
T cells are major players in regulating the development of an immune response.
In fact, each of the thousands of T cells within your body is different from every other one.
When the two are connected, he said, they form a bridge and send a signal to the T cells.
So T cells that recognize these proteins are not destroyed.