Serum lipoproteins are physiological components of the blood and are divided into three major classes on the basis of lipid content, specific density and concentration. Human serum lipoproteins are distributed among the very low density lipoproteins (VLDL, d 0.94- 1.007 g/ml), the low density lipoproteins (beta-lipoproteins, LDL, d 1.007-1.063 g/ml), and the high density lipoproteins (alpha-lipoproteins, HDL, d 1.063-1.21 g/ml). This division is generally used for lipoprotein classification of other animals, although the boundary may differ from species to species. The best established function of lipoproteins is the transport of biologically important components such as tryglicerides, phospholipids, cholesterol and fat soluble vitamins. Additional functions ascribed to lipoproteins are as yet poorly understood and require further investigations. 

J. Rapacz

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 291–298, 1974
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