CD85k is a type I transmembrane glycoprotein of ILT/LIR family, and contains three ITIM motives, which recruit protein tyrosine phosphatases SHP-1 and SHP-2, resulting in supression of signal transduction. It is expressed by monocytes, macrophages, and dendritic cells. Antigen presenting cells expressing CD85k and CD85d appear to be crucial to the generation of CD8+ suppressor T cells and CD4+ regulatory T cells.