Fig.1From: Panax notoginseng: derived exosome-like nanoparticles attenuate ischemia reperfusion injury via altering microglia polarizationIsolation and characterization of PDNs. a Schematic illustration of isolating process of PDNs. b Size distribution of PDNs detected by DLS. c Zeta potential of PDNs dissolved in PBS. TEM image of PDNs d before and e after freeze-drying. Scale bar = 100 nmBack to article page