Or it may release immune system cells in the body.

These parts are then shown to other cells of the immune system.

In the treatment, patients have their blood run through a machine for two or three hours to extract certain immune system cells.

This material is then displayed to other cells of the immune system.

"In the center of the ball is an egg, and around the eggs are immune system cells."

They also cause other immune system cells to destroy foreign substances.

These immune system cells help to block the spread of cancers.

But babies have billions of immune system cells in their bodies.

Many immune system cells are produced in the bone marrow.

The highest levels are found in neuronal cells of the central nervous system.