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Labelled Arachidonic Acid. An essential fatty acid and a precursor in the biosynthesis of prostaglandins, thromboxanes, and leukotrienes. Occurs in liver, brain, glandular organs, and depot fats of an imals, in small amounts in human depot fats, and is a constituent of animal phosphatides.

Arachidonic acid (ARA) governs the cell membrane fluidity and ion channels activity. Accumulation of free ARA leads to cytotoxicity followed by cell death.