Fig. 4. Synthesis of FITC-labelled cyclic RGD peptide 2p and its integrin binding assays analyzed by confocal microscopy. (a) Linear peptide 1p-FITC, (b) cyclo-(RGDfK)-FITC, (c) cyclic peptide 2p-FITC. All peptides were used at 2 μM concentration for the cell binding studies. The RGD motif is in blue, and the Cβ–Ar bond is in red. Scale bar: 50 μm.
