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In the structure of nike free run 5.0 lecithin derived from egg yolk, arachidonic acid is involved in signal transduction and ensures high membrane fluidity. It is important for body weight development. On the other hand, docosahexaenoic acid is required for normal development of the brain, nervous system, and visual acuity. Consequently, both these important components of the structure of lecithin play a vital role during pregnancy and infancy. Since babies have only limited capacities, they need arachidonic acid and docosahexaenoic acid to synthesize fatty acids from their precursors.Structure of Lecithin: Soy Markedly different from egg yolk lecithin, the structure of lecithin derived from soy actually consists of three types of phospholipids: phosphatidylcholine (PC), phosphatidylethanolamine (PE), and phosphatidylinositol (PI). Since soy lecithin is obtained in the process of degumming crude soy oil, it contains minimal amounts of hydratable compounds (1.8%), comprised primarily of phosphatides. After going through the synthesizing process, the resulting structure of lecithin is 30-35% crude soy oil and 65-70% phosphatides. Oil can then also be removed completely with the addition of acetone.