To investigate which DC subsets (cDC1: CD11c+CD141+, cDC2: CD11c+CD1c+, pDC: CD11c−CD123+) may be the source of the increased expression of IFNκ and IFNλ1 in the inflamed joint, DCs were sorted from SFMNC of oligoarticular JIA patients (N = 3; Supplementary Figure 6). Here, IFNL1 is linked to oligoarticular juvenile idiopathic arthritis.