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Which cells secrete histamines that trigger inflammatory pathways? which cells secrete histamines that trigger inflammatory pathways? neutrophils mast cells nk cells macrophages?

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BioWizard
The correct answer is: mast cells.  

Mast cells are a type of white blood cells which contains granules rich in histamine. Histamine is released through degranulation and it is a mediator of the inflammatory response (for example, allergic inflammation). It acts by increasing the permeability of the capillaries to white blood cells and some proteins.