CXCL9 and systemic sclerosis: In comparison to control cells, H2O2 treatment induced a strong release of CXCL-9, CXCL-10 and CXCL-11 in SSc fibroblasts respectively by 4.5 ± 1.6, 5.2 ± 1.2 and 5.9 ± 2.4 fold (Figure 1A–C), whereas no effects were observed in healthy cells.