Levels of mRNA of the three inflammatory chemokines CCL5 (RANTES), CCL3 (MIP-1α) and CXCL10 (IP-10) were measured by RT-PCR in eight pairs of PBMCs or SFMCs from patients with JIA (five persistent oligoarticular, three extended oligoarticular), and PBMCs from five healthy controls (Figure 1a), using equal cell numbers for each cDNA preparation. This evidence concerns the gene CXCL10 and juvenile idiopathic arthritis.