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Angiopoietin-like 3, also known as ANGPTL3, is a member of the angiopoietin-like family of secreted factors. It is expressed predominantly in the liver, and has the characteristic structure of angiopoietins, consisting of a signal peptide, N-terminal coiled-coil domain, and the C-terminal fibrinogen （FBN）-like domain. The FBN-like domain in angiopoietin-like 3 protein was shown to bind alpha-5/beta-3 integrins, and this binding induced endothelial cell adhesion and migration. This protein may play a role in the regulation of angiogenesis. ANGPTL3 also acts as dual inhibitor of lipoprotein lipase （LPL） and endothelial lipase （EL）,[7] thereby increasing plasma triglyceride, LDL cholesterol and HDL cholesterol in mice and humans.