Phospholipids

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Phospholipids are found in cell membranes. Fats stick together and don’t dissolve in water. Think oil and vinegar. Phosphate is soluble in water and lives on one end of a phospholipid. Most of a cell membrane is made of fat, but they are happy in water because the outer portion of the membrane is where the phosphates live. Red blood cell phospholipids are useful for testing fat composition because blood is easily extracted and because the water soluble portion of the phospholipids help to separate them from other fats.

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