High expression of mRNA for CCL5 in purified T cells from the joint of patients with juvenile idiopathic arthritis (JIA). (a) Oligonucleotide-specific probing of blotted amplification products of CCL5 after RT-PCR from paired sets of purified T cells from 15 JIA patients (5 persistent oligoarticular, 5 extended oligoarticular, 5 polyarticular). (b) Relative levels of CCL5 mRNA in purified T cells from each JIA subgroup. Black bars, peripheral blood (PB) CD3+ cells; white bars, synovial fluid (SF) CD3+ cells. Bars represent mean values; error bars one standard deviation.