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.