Coarse, bluish-black staining cytoplasmic granules, bounded by a plasma membrane and found in mast cells and basophils. Contents include histamine, heparin, chondroitin sulfates, chymase and tryptase. (Gene Ontology, GO_0042629)
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16 proteins localized to the mast cell granule cellular component from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset.