 This study examined the size-dependent endocytosis of gold nanoparticles, AUNPs, in various cancer cells. It found that smaller AUNPs, tilde 45nm, had a higher uptake rate than larger ones, tilde 75nm. This suggests that smaller AUNPs may be more suitable for drug delivery applications, whereas larger AUNPs could be used to reconstruct the cell morphology. This article was authored by Li Kewei, Wang Shenghan, Chu Arthur, and others.