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Antigen, CD5

Glycoproteins expressed on all mature T-Cells, Thymocytes, and a subset of mature B-Cells. Antibodies specific for CD5 can enhance T-Cell Receptor-mediated T-Cell activation. The B-Cell-specific molecule CD72 is a natural ligand for CD5. (From Abbas et al., Cellular and Molecular Immunology, 2d ed, p156)