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From Wikipedia, the free encyclopedia

Specific granules are secretory vesicles found exclusively in cells of the immune system called granulocytes. They are also known as secondary granules.

It is sometimes described as applying specifically to neutrophils, [1], and sometimes the term is applied to other types of cells.[2]

These granules store a mixture of cytotoxic molecules, including many enzymes and antimicrobial peptides, that are released by a process called degranulation following activation of the granulocyte by an immune stimulus.



Examples of cytotoxic molecule stored by specific granules in different granulocytes include:

Clinical significance

A specific granule deficiency can be associated with CEBPE.[3]


  1. ^ "Definition: specific granule from Online Medical Dictionary".  
  2. ^ Okuda M, Takenaka T, Kawabori S, Ogami Y (July 1981). "Ultrastructural study of the specific granule of the human eosinophil". J. Submicrosc. Cytol. 13 (3): 465–71. PMID 7334549.  
  3. ^ Online 'Mendelian Inheritance in Man' (OMIM) SPECIFIC GRANULE DEFICIENCY; SGD -245480

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