Assemblies of lipids and proteins in blood plasma transporting lipids between tissues.
Note: They are structurally very similar to intracellular lipid droplets. They are classified according to their size and buoyant density into five types with different functions: chylomicrons, very low density lipoproteins (VLDL), intermediate lipoproteins (IDL), low density lipoproteins (LDL), and high density lipoproteins (HDL).
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1180 (https://doi.org/10.1515/pac-2016-1120)