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DNA Immobilization and cell-responsive release from a model substrate. (A) A SAM-modified (orange lines) gold-coated surface is covalently attached to pDNA-PNA-peptide (DPP) conjugates. (B) The SAM-bound conjugates are complexed with a polycation (+). (C) Upon cellular migration along the substrate and the release of matrix metalloproteinase (MMP) (lightning bolts), the surface is capable of cell-responsively releasing pDNA and transfecting cells.
