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The vast majority of dietary fats are found in the form of triglycerides. Triglycerides can come directly from the ncbi diet or can be made endogenously by the body from excess dietary carbohydrates or proteins. ncbi Triglycerides are stored in adipose tissue and act as a reservoir of caloric energy. Most of the fatty ncbi acids used for membrane structures are in the form of phospholipids, not triglycerides. A phospholipid also has a glycerol backbone, with two fatty acids and a highly polar base molecule attached in the third position. That base molecule is usually inositol, serine, ethanolamine, or choline. Phospholipids allow for the formation of a lipid bi-layer, with the non-polar fatty acids portion migrating towards the center and the polar bases forming a polar outer and inner layer of the membrane, that allows interface with the aqueous medium inside and outside the cell.
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