#polyunsaturated_fatty_acid__polyunsaturatedfattyacid  an unsaturated fatty acid whose carbon chain has more than one double or triple valence bond per molecule; found chiefly in fish and corn and soybean oil and safflower oil
  supertype:  #unsaturated_fatty_acid__unsaturatedfattyacid  a fatty acid whose carbon chain can absorb additional hydrogen atoms
  subtype:  #alpha-linolenic_acid__alphalinolenicacid  a polyunsaturated fatty acid most abundant in canola oil; a fatty acid essential for nutrition
  subtype:  #docosahexaenoic_acid__docosahexaenoicacid  a polyunsaturated fatty acid found in fish (especially tuna and bluefish)
  subtype:  #elcosapentaenoic_acid  a polyunsaturated fatty acid found in fish (especially tuna and bluefish)
  subtype:  #linoleic_acid__linolic_acid__linolicacid  a liquid polyunsaturated fatty acid abundant in plant fats and oils; a fatty acid essential for nutrition; used to make soap
  subtype:  #linolenic_acid__linolenicacid  a liquid polyunsaturated fatty acid that occurs in some plant oils; an essential fatty acid

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