Figure 1 .

Plasma from patients with JIA or controls rarely contain antibodies against recombinant human GPI. Enzyme linked immunosorbent assays (ELISAs) were performed on sera (diluted 1:50) from 82 patients with JIA or 81 controls matched for age to detect antibodies against recombinant human GPI (produced in E coli in our laboratory). The cut off point for a positive value was defined as two standard deviations above the mean optical density of the 81 samples from healthy donors (dotted line).