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Fatty-acid chain elongation in rat small intestine.

Microsomal fractions from rat small intestine contain a fatty-acid chain-elongation activity. Cofactor requirements are similar to those of the liver microsomal system, but substrate specificity is different. The polyunsaturated arachidonic and timnodonic acids were elongated at very low rates. These results suggest that the relative contents of specific chain-elongation enzymes are different in liver and small intestine.