IFNG and spondyloarthropathy: We observed a significant expansion of GM-CSF+IL-17A− cells in both CD4 and CD8 cells in spondyloarthritis compared to the two control populations (Fig. 1e, f), but saw no difference in the CD56 and γδ compartments (Supplementary Fig. 1D, E), and no difference in the percentage of IFN-γ+ cells was seen in the CD4, γδ and CD56 compartments (Supplementary Fig. 1B–E).