CXCL9 and systemic-onset juvenile idiopathic arthritis: Several chemokines and receptors, including CXCL9, 10, 11, 12, 13, and CXCR3 and CXCR4, were found in high concentrations in the serum of patients with SJIA or AOSD, and these correlated with several disease activity markers of SJIA or AOSD [96,97,126,127].