PDGFRA and systemic sclerosis: Figure 1A and figure 2A shows specific bands for both PDGFR-α and α-SMA mRNA and protein expression in all treatment groups separately, with more obvious expression in SSc fibroblasts. Figure 1B and figure 2B shows the relative gray scale (target mRNA and protein expression normalized to that of β-actin) to quantify the results shown in figure 1A and figure 2A respectively.