IFNG and rheumatoid arthritis: With respect to IFNγ (Fig. 4c), non-pregnant RA patients displayed the highest proportions of IFNγ-positive Vδ1 and IFNγ-positive Vδ2 cells, which significantly differed from the median proportions found in non-pregnant healthy controls (Vδ1, P = 0.04; Vδ2, P = 0.02).