Mast Cell Activation Syndrome (MCAS) & Lyme Disease

What are Mast Cells? Mast cells are immune cells that originate in the bone marrow and release up to 200 signalling chemicals, or mast cell mediators, into the body as part of an immune system stabilizing defense response against foreign invaders (parasites, fungi, bacteria, or viruses), allergens and environmental toxins and contribute to tissue homeostasis and repair, according to Matthew

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