BST2 and cancer: Among these RRs, blood dendritic cell antigen 2 (BDCA-2, CD303, CLEC4C) is an lectin-like receptor (13), while immunoglobulin-like transcript (ILT7, CD85g) binds to and can be activated by bone marrow stromal cell antigen 2 (BST2, CD317, tetherin, HM1.24) protein, the expression of which is found on cells pre-exposed to IFN-I or on the surface of human cancer cells (14).