Figure 6. Retrograde transport of silica-coated iron oxide nanoparticles and polymer nanoparticles.

(a) Robust retrograde transport trajectories of silica-coated INP endosomes (black, 45 W/cm², 10fps, 561 nm). (b) Retrograde trajectories of polymer nanoparticle endosomes, stalling within seconds of entering the field of view (red/gray, 15 W/cm², 10fps, 488 nm). Inset shows the endosome jumps before the endosome became stationary under the laser illumination.