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Mast cells play a key role in the inflammatory process.

"And some people simply have excitable mast cells," she added.

This causes the mast cells to release a variety of chemicals into the blood.

Mast cells seem to have other roles as well.

Doctors can confirm the presence of mast cells by rubbing the baby's skin.

Possible candidates include mast cells, known to facilitate the inflammatory response.

The bug bites are actually the clumps of mast cells.

Because they gather together around wounds, mast cells may play a part in wound healing.

Using special techniques on a bone marrow sample, the doctor looks for an increase in mast cells.

Researchers also think mast cells may have a role in the growth of blood vessels (angiogenesis).