CD63 is a lysosomal granule-membrane glycoprotein and has been detected on the surface and in the cytoplasma of a variety of cells, particularly in platelets; surface expression indicates lysosomal secretion. CD63, present only in azurophil granules of non-stimulated neutrophils, is strongly expressed at the surface of neutrophils after activation showing that CD63 is a good marker for granule release; this phenomenon has been also reported for basophils. CD63 is present in cell line PHA blasts, K562, U937, KG1a, RAJI. Both surface and cytoplasmic reactions are reported. CD63 antigen has a diverse distribution on the surface and in the cytoplasm of many cell types including lymphoid, myeloid, endothelial cells and melanoma.
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.