CD4 and systemic lupus erythematosus: Similar to the findings of SLE patients (Supplementary Figure 3), both B6.MRL/lpr and B6 control mice showed undetectable expression of NKG2DLs (Mult-1, the counterpart of human ULBPs; H60; Rae-1) on the CD3+CD4+ T cells (Supplementary Figure 5).