Fig. 4

Zeta potentials (a) and particle sizes (diameter) (b) of siRNA, siRNA with Tat/PEI, INT, and siRNA with mTat/PEI/INT. Effects of temperature on siRNA transfection efficiency with mTat/PEI, INT, or mTat/PEI/INT in HSC-3 cells at 4 °C (white bars) or 37 °C (black bars) (c). *p < 0.05 and **p < 0.01