CLEC4M and plasma cell myeloma: The DC-SIGNR recombinant protein (R&D Systems, Inc., USA) encodes the extracellular domain (Ser 78-Glu 399) of human DC-SIGNR and is stably expressed in mouse myeloma cell line (derived from NS0 cell, the non-Ig secreting and non-light chain-synthesizing cell line) by Gene engineering technique.