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serve several physiological functions in vertebrates. As components of specific phospholipids, they are important to the integrity of cellular lipid membranes and their associated enzyme activities. They provide the C20 fatty acid precursors for the hormone-like eicosanoid compounds needed for localized metabolic composition d regulation in many tissues (Dadd 1983). The essential fatty acids also regulate cellular lipid metabolism and are required for growth. Biochemically, composition d fatty acid deficiency in warmblooded vertebrates is characterized by reduced levels of the tetraene, arachidonic acid (C20:4w6) and increased levels of the triene, eicosatrienoic acid (C20:3w9) composition d (Dadd 1983). Linoleic acid, the root member of the w6 (or n6) family, can be metabolized by carbon-chain elongation and further desaturation to arachidonic acid through the following steps (w6 family): 18:2w6 (linoleic) to 18:3w6 to 20:3w6 to 20:4w6 (arachidonic).
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