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Cumulative transfection of NIH-3T3 (a) and SMC (b) cells with SEAP-DNA (secreted alkaline phosphatase based luminescence). Three surfaces were used: stainless steel mesh coated with DNA/reducible polymer multilayer (■), DNA/PEI multilayer (●), and control non-coated mesh (▲). Reproduced with permission from Biomaterials. Copyright Elsevier 2009 [107].
