While mast cells play an important role in the pathogenesis of SLE, there was no difference in mast cell recruitment to PVAT of lupus mice compared with control mice, as determined by toluidine blue staining (Supplementary material Figure S5A) or mast cell-specific gene expression (CD117, Supplementary material Figure S5B). The gene discussed is KIT; the disease is systemic lupus erythematosus.