CCL3 and juvenile idiopathic arthritis: Protein levels of CCL3 (MIP-α), CXCL10 (IP-10) and CCL5 (RANTES) were measured in plasma and paired SF (prepared by identical method) from a subset of 14 of the patients (4 persistent oligoarticular, 6 extended oligoarticular, 4 polyarticular JIA), and in plasma from 14 healthy control children.