Definition: a type III transmembrane protein present on leukocytes, platelets, osteoblasts, and osteoclasts; contributes to the transduction of CD2-generated signals in T cells and natural killer cells; facilitates cytoplasmic calcium flux in B cells, monocytes, and granulocytes; and plays a role in activation of the monocyte oxidative burst; expressed in hemopoietic neoplasms and myelomas.
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Examples: glitazone, GI cocktail, etc.