IL4 and systemic lupus erythematosus: Fig 6A shows a representative profile of the dot-plot quadrant analysis for iNKT expansion and histograms of IFN-γ and IL-4 intracellular staining in control and SLE MNCs cultured with α-GalCer (100 ng/ml) without or with IL-15 (10 ng/ml) for 10 days.