lecithin

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lecithin (les-i-thin) n. one of a group of phospholipids that are important constituents of cell membranes and are involved in the metabolism of fat by the liver. An example is phosphatidylcholine. l.-sphingomyelin ratio (LS ratio) a measure of fetal lung maturity; an LS ratio below 2 indicates a higher risk of respiratory distress syndrome.

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