article_snippet.sent: Mast cells are the regulators of your immune system.
article_snippet.sent: Mast cells're the ones that release histamine when a bug bites, or when you come into contact with an allergen.
article_snippet.sent: Mast cells basically sound the alarm that lets the rest of your immune system know something is wrong.
article_snippet.sent: But mast cells are located in your connective tissue, including your skin and the lining of your stomach and intestine.