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The frequency of killer cell immunoglobulin-like receptor (KIR)2DS1(+)2DL1–human leucocyte antigen (HLA)-CwLys(–) in systemic lupus erythematosus (SLE) and control group. The frequency of KIR2DS1 was increased when KIR2DL1/HLA-Cw were absent in SLE, and the difference was significant (P = 0·001).
