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Fluorescent microscopy of GFP expression in COS-7 cell lines transfected with different gene carriers. Fluorescent cells were visualized at 48 h post-transfection. (a) Untreated, (b) naked DNA, (c) PEI/phMGFP, (d) D-SPM/phMGFP at ratio 12, (e) D-SPM/phMGFP at ratio 14, and (f) D-SPM/phMGFP at ratio16. (Magnification x10).
