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Proliferation of Balb 3T3/c cells on the modified PDMS samples (prepolymer to curing agent ratio—5:1, 10:1, and 20:1). PDMS samples were modified using UV irradiation or oxygen plasma activation and protein adsorption: gelatin, collagen, fibronectin, laminin, and poly-L-Lysine. The red line indicates proliferation for the positive control—polystyrene surface. (n ≥ 3, asterisk indicates p < 0.05).
