IFNG and juvenile idiopathic arthritis: These fate‐mapping data, taken together with our findings on shared TCR and transcriptional profiles and the observation that a high frequency of synovial Tc17 cells express IFNγ, suggest that synovial Tc17 cells can transition to a Tc1‐like cytokine profile, as was previously suggested for Th17 and Th1 cells in the joints of patients with JIA 33.