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https://www.noaa.gov/media/digital-library-photo/pl23fish7908jpgDescription
Chart showing difference between saturated fat molecule below, and above is apolyunsaturated fat molecule. The two main features that distinguish fish oilfrom other animal fats are the unusually long fatty acid chains in fish oil andtheir high degree of unsaturation. (Image credit: NOAA Central Library Historical Fisheries Collection; P. 42 of Our Changing Fisheries 1970 Centenary NMFS centenary volume | Artwork by Bob Hines)