CCL3 and juvenile idiopathic arthritis: After separation into myeloid and lymphoid populations, RT-PCR of CCL3 and CXCL10 on separated cells from three JIA patients (one persistent oligoarticular, one extended oligoarticular, and one polyarticular) showed that these two chemokines were transcribed predominantly in the myeloid population (Figure 1b) as also seen in controls (data not shown).