Fig. 3.

ECM protein deposition on gold islands. A, SPR traces displaying the exposure of POEGMA brushes (solid lines) and bare gold chips (dashed lines) to ECM proteins (black, collagen I; red, fibronectin; blue, laminin; green, BSA). B, Deposition of collagen I on substrates patterned with POEGMA brushes; two different brush thicknesses are compared and three different washing protocols (washing with PBS or dilute acid and dilution of the collagen solution with dilute acid prior to washing with PBS); the shapes of the patterns used for 20 and 100 nm brushes are different; scale bar: 100 μm.