MX1 and systemic lupus erythematosus: In our study population, levels of the five individual IFIGs were not statistically different between SLE patients and controls, although MX-1 and IFI44 levels were higher among lupus patients [median (IQR) expression levels: 4.4 (0.4, 48.5) in SLE versus 0.9 (0.3, 17.0) in controls; 5.3 (0.9, 55.4) in SLE versus 4.0 (0.7, 49.0) in controls, respectively].