<unk>  is a type of<unk>  often used to purify enveloped viruses (with densities 1.1-1.2 g/cm³) and ribosomes, and also to separate cell organelles from crude cellular extracts. This method is also used to purify exosomes.
Sucrose gradient centrifugation
Electrophoresis
Counterimmunoelectrophoresis
Native PAGE
Isoelectric focusing
Biological small-angle X-ray scattering
Hemagglutination assay
Förster resonance energy transfer