Fig. 1From: Upconversion nanoparticles for super-resolution quantification of single small extracellular vesiclesSchematic illustration of upconversion nanoparticles (UCNPs) for the super-resolution quantification of surface biomarkers on single tumour cell-derived small EVs. a sEVs carrying heterogeneous distribution of biomarkers are released from the tumour cell. b sEVs can be captured on an antibody-coated plate and labelled by UCNPs. c UCNPs -EV conjugates detected as single bright spots with different intensities can be super-resolved in super-resolution nanoscopyBack to article page