Fig. 5.

CLSM images of HeLa cells incubated with MSNs–CDs (200 μg mL⁻¹) for 4 h. As a comparison, HeLa cells were pretreated for 2 h with excess folic acid (FA) for folate receptor (FR) saturation and then incubated with MSNs–CDs (200 μg mL⁻¹) for another 4 h. Scale bar is 25 μm