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Several other lipids are also found in your body. Some are vital components of your brain. An important group includes phospholipids, which resemble triglycerides in structure – the main difference is that one of the fatty acid groups is replaced by one that contains phosphorus. This alters the properties of the molecule because half of its structure is soluble in fat whereas the other dissolves in water. These dual solubility properties allow phospholipids to act as detergents and, together with special proteins, phospholipids are able to interact with cholesterol and triglycerides to form packages of lipids that are stable in water.