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An eicosanoid is a lipid consisting of twenty or more carbons. Lipids as molecules are extremely long amphipathic hydrocarbon chains, between two and twenty carbons connected to a COOH or COO- tail. Eicosanoids are the upper range of lipids, pushing the maximum. They can be either saturated or unsaturated. They will generally be solids at room temperature, with a consistancy similar to waxes.

A type of hormone which forms when the body breaks down arachidonic acid. Examples include the leukotrienes, lipoxins, prostaglandins, and thrombaxanes.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

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