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Figure 3 Effect of the integrin-binding cyclic Arg-Gly-Asp peptide (cRGD) on endothelial progenitor cell (EPC) and smooth muscle cell (SMC) invasion. (A) cRGD (100 µg/ml) stimulated significantly the invasive potential of EPCs compared with control cells, whereas SMC invasion against different concentrations of cRGD was not altered (B). DMEM = Dulbecco's modified eagle medium.