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MTP (Microsomal Triglyceride Transfer Protein) is an endoplasmic reticulum membrane protein primarily responsible for lipid transport and lipoprotein assembly. Expressed in liver, intestine, and adipocytes, MTP promotes lipoprotein maturation and secretion by transferring triglycerides and cholesterol esters to nascent lipoprotein particles. MTP regulates blood triglyceride and cholesterol levels, with its dysfunction implicated in various lipid metabolism disorders such as familial hypobeta-lipoproteinaemia and cardiovascular disease.