What is apolipoprotein?

Apolipoprotein is the protein constituent of lipoproteins such as HDL and LDL, which circulate normally in blood plasma; classified according to function into four groups: A, B, C, E.
a. A-l Apolipoprotein that activates the liver enzyme LCAT; found in HDL and in chylomicrons; apo A-I deficiency is associated with low levels of HDL and Tangier disease.
a. B The main protein of LDL, found also in VLDL and IDL; elevated levels of apo B occur in individuals with hyperlipoproteinemia.

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