Fig. 3From: Targeting Endothelial Cells with Multifunctional GaN/Fe NanoparticlesTEM pictures taken from a single endothelial cell incubated with GaN/Fe nanoparticles. a Nanoparticles distribution within cellular vesicles. b–d The uptake process of nanoparticles into vesicles. Red arrows indicate nanoparticles that appear darker in TEM due to high atomic density compared to biological mediaBack to article page