Figure 3A shows the uptake of the nanoparticles significantly
increased for the first 2 h, but the uptake rate gradually
slowed and reached a plateau at 4- 7 h, depending on size.
This plateau effect is in agreement with a previous ฃThe maximum number of nanoparticles
a cell can uptake for sizes 14, 50, and 74 nm are
3000, 6160, and 2988 respectively