**Figure 3.** Viability of NIH 3T3 cells transfected with different plasmids or
with empty vector control. Data are presented as means ± SEM. Transfection
was repeated 6 times for each group. The letter on the top of each bar
indicates the statistical result; different letters indicate statistical
significance
(P ≤ .05), whereas the same letter indicates lack of statistical
significance.