Figure 2From: Elevated matrix metalloproteinase-9 in patients with systemic sclerosisConcentrations of circulating matrix metalloproteinase-9 (MMP-9) in patients with diffuse (n = 23) or limited (n = 19) systemic sclerosis and in healthy controls (n = 32). Data are presented as means ± standard error of the mean (Mann–Whitney rank sum test).Back to article page