NCR2 belongs to the natural cytotoxicity receptor (NCR) family and contains 1 Ig-like (immunoglobulin-like) domain. This protein interacts with TYROBP/DAP12 and is selectively expressed by activated NK cells and by in vitro cultured (i.e. activated) TCRg/d lymphoid cells. NCR2 is a cytotoxicity-activating receptor that may contribute to the increased efficiency of activated natural killer (NK) cells to mediate tumor cell lysis. Recombinant human NKP44 protein, fused to His-tag at N-terminus, was expressed in E.coli