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Description
CD63 is a 53 kD, type III lysosomal glycoprotein, expressed on activated platelets, monocytes and macrophages. This molecule is also referred highly to as LIMP, gp55,melanoma-associated antigen ME491, Pltgp40, LAMP-3 and is a member of the tetraspan transmembrane 4 superfamily (TM4SF). It is also widely expressed on surface and in the cytoplasm of various hematopoietic (monocytes, macrophages) and non-hematopoietic cells (endothelium, fibroblasts, osteoclasts, smooth muscle). Its cellular function has not been fully elucidated. Reports suggest this as a useful molecule to study platelet activation.