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What is Arachidonic Acid (ARA)?

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What is Arachidonic Acid (ARA)?

Arachidonic acid (AA, sometimes ARA) is a polyunsaturated omega-6 
fatty acid 20:4(W-6). It is structurally related to the saturated 
arachidic acid found in Cupuaçu butter ( peanut).
In chemical structure, arachidonic acid is a carboxylic acid with a 
20-carbon chain and four cis-double bonds; the first double bond is 
located at the sixth carbon from the omega end.

Arachidonic acid is a polyunsaturated fatty acid present in the 
phospholipids (especially phosphatidylethanolamine, 
phosphatidylcholine, and phosphatidylinositides) of membranes of the 
body's cells, and is abundant in the brain, muscles, and liver. 
Skeletal muscle is an especially active site of arachidonic acid 
retention, accounting for roughly 10-20% of the phospholipid fatty 
acid content on average.