Edited sentence: An examination of the brains of depressed rats compared them with brains from normal rats.In the Journal of Lipid Research, an American Society for Biochemical and Molecular Biology journal, a study dated 2005-05-25 used the Flinders Sensitive Line rats to investigate the link between omega-3 fatty acids and depression.Specifically, they discovered that brains with depression had higher concentrations of anachidonic acid, a long-chain unsaturated metabolite of omega-6 fatty acid.Surprisingly, they found that the main difference between the two types of rates was in omega-6 fatty acid levels and not omega-3 fatty acid levels.The findings suggest that it is not a lack of omega-3 fatty acids but a higher increase of arachodonic that is implicated in depression