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. [GOC:jl, http://www.ijp-online.com/archives/1969/001/02/r0000-0000tc.htm, PMID:12360215]
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M5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component