Figure 2. Quantitative assessment of DNA binding to NMBs and CMBs (n=3 per group). The DNA loading capacity of the cationic microbubbles (CMBs) was significantly higher than that of the neutral microbubbles (NMBs), regardless of the plasmid dosage in the microbubble solution (*p<0.01 relative to 10, 40, and 80 μg of plasmid DNA, within-group comparisons; #p>0.05 relative to 80 μg of plasmid DNA, within-group comparisons; **p<0.05 relative to the CMBs in each group).