Fig. 1From: Exosome origin determines cell targeting and the transfer of therapeutic nanoparticles towards target cellsCharacterization of HGNs and PEG-HGNs. a TEM images of HGNs and PEG-HGNs (above). PEG functionalization is clearly visible around the nanospheres by a negative staining to contrast the organic shell. Size distribution diagram of NPs obtained from TEM images (bottom). b UV–VIS absorption spectra for both types of nanoparticles. A maximum absorbance peak was observed at 850 nm, corresponding with the geometrical shape and size of these NPsBack to article page