| http://www.w3.org/ns/prov#value | - Besides free fatty acids, possible metabolites include but are not limited to molecules such as drugs, drug metabolites, hormones, prostaglandins, leukotrienes, sphingosine, sphingolipids, phospholipids, glycolipids, cholesterol and cholesterol derivatives and other steroids, lipid-soluble vitamins, bile salts, enzyme cofactors, retinoids such as retinoic acid and retinal, heme and heme metabolite
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