IL15 and systemic lupus erythematosus: IL-15 enhanced CD11a expression of α-GalCer treated iNKT cells from SLE patients (97.4±0.6% vs. 83.8±3.0%, p<0.001) as well as controls (98.4±0.5% vs. 86.5±4.1%, p = 0.004) (Fig 5C).