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Toluidine blue is a basic thiazine metachromatic dye that stains nuclei blue, and can be used to differentiate different types of granules (e.g. within mast cells).
21 min read 
What are mast cells? Definition of mast cells Mast cells are a type of immune cell found in connective tissue that are involved in allergic reactions, immune responses, inflammation, and wound healing. They contain granules rich in histamine and play a crucial role in the body’s defense against pathogens. Structure of Mast cell Types of … Read more