CD4 and juvenile idiopathic arthritis: In studies of γδ T cells in the SF, it was found that in oligoarticular JIA, SF contained higher Treg (10.01% vs. 2.66% of CD3+CD4+) and γδ T cells (20.29% vs. 10.58% of CD3) than PB, and that higher levels of γδ T cells 919% vs. 15%) predicted more relapse within a median of 35.6 months [74].