Is a mast cell granulocyte?

Mast cells are not granulocytes. Granulocytes are a type of white blood cell that includes neutrophils, eosinophils, and basophils. Mast cells are a type of tissue-resident immune cell that is found in connective tissue and mucosal linings. They are derived from myeloid progenitor cells in the bone marrow, but they differentiate and mature in tissues rather than in the bone marrow. Mast cells are involved in various immune responses, including allergic reactions and defense against parasites.