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(A) Number of cells per mm2 and (B) spreading area of REF YFP-pax on PEG monolayers with different mol % of PEG-alkyne functionalized with cyclic RGD. Data are evaluated after 4 h of adhesion by means of fluorescence staining of cell nuclei (DAPI) and actin (phalloidin-TRITC). *p < 0.003 and **p < 0.0001.
