It contains complex sugar molecules called polysaccharides, which some studies show stimulate virus-fighting cells in the immune system.

Many growth factors bind to receptors at the cell surface and stimulate cells to progress through the cell cycle and divide.

That factor, in turn, stimulates cells to divide and tissues to mature.

When your body encounters an allergen, it stimulates special cells called IgE antibodies.

Or they may employ the reverse strategy, finding ways to stimulate healthy cells to become even more resistant to chemotherapy by producing more metallothionein.

They thought it would be neat to stimulate such cells externally by applying an electric current directly to the scalp.

For example, epidermal growth factor stimulates cells of the top layer of skin.

It stimulates immune cells like macrophages and neutrophils, which can engulf microbes that slip into the wound.

One of its effects is to stimulate enterochromaffin-like cells.

These fields can be positioned on different parts of the head to stimulate cells in different parts of the visual system.