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mast cell granule (GO:0042629)
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.
General
lysosome (GO:0005764)
References
gene ontology: GO:0042629
PMID: 12360215