Figure 1.

Serum concentrations of IL-15 in patients with systemic sclerosis increase compared with healthy control individuals. Striped circles, patients on cortisone treatment; filled circles, two patients with renal crises; horizontal bars, median (25th and 75th percentiles) in each group; dashed line, cut-off value for increased serum levels of IL-15 (75th percentile of all systemic sclerosis (SSc)); fine dotted line, detection level. dcSSc, diffuse cutaneous systemic sclerosis; lcSSc, limited cutaneous systemic sclerosis; n.s., not significant.