SIRPA and non-small cell lung carcinoma: We verified the specificity of various commercial SIRPγ antibodies, which recognized recombinant SIRPγ but not SIRPα, in a dot blot assay (Supplemental Figure 2I) and detected obvious SIRPγ protein expression in control NSCLC A549 and H1975 cells, but not in SIRPγ-knockdown cells in Western blot assays (Supplemental Figure 2, B and C).