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" ... The search for pure sources of each of these fatty acids was on. Scientists discovered, patented and cultivated strains of algae that produced EPA or DHA, extracting their oils on an industrial scale. But high production costs ultimately led to a new search, this time for cheap methods of enriching the fatty acid content of existing foodstuffs. Two paths emerged: Scientists could either selectively cultivate existing crops to produce long-chain fatty acids, or they could find a way to raise livestock to metabolize more of the short-chain omega-3 fats found in feedstuff into long-chain variants. ... "