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Gradient echo in vitro MRI images of the two composites (0.2 ng branched bPEI/0.5 μg pEGFP-C1 pDNA/1.0 μg citrate-NP and 0.2 ng branched bPEI/0.5 μg pEGFP-C1 pDNA/2.5 μg citrate-NP)-transfected U87MG cells in Eppendorf tubes with culture medium.
