Figure 1From: Elevated matrix metalloproteinase-9 in patients with systemic sclerosisComparison of serum concentrations of matrix metalloproteinase-9 (MMP-9) and tissue inhibitor of metalloproteinase-1 (TIMP-1) in patients with systemic sclerosis versus healthy controls. Data are presented as means ± standard error of the mean (Mann–Whitney rank sum test).Back to article page