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Transfection efficiency (A) of jetPEI/pGFP complexes alone and with 10 μM T904 or 4-arm PEG and gel degradation products containing 10–50 μM T904 was assessed by flow cytometry and expressed as mean fluorescence units. Corresponding cell viability (B) was measured by MTT assay. (*P<0.05 relative to jetPEI/pGFP alone)
