Figure 2.

The representative transfection image for GFP-expressing cells using PEI and PEI-derived nanoparticles as gene delivery vectors. The GFP expression was observed under fluorescent microscope at 10 × magnification. Figure A, C, E standed for the transfection image that used PCFC-g-PEI, FA-PEAs and HPEI as a gene delivery vector respectively. And figure B, D and F represented the transfection image with 25-kD PEI and 2-kD PEI as gene vectors. Figure a-f showed the transfection image which was corresponding to Figure A-F in bright field. The scale bar represents 31.41 μm.