Abstract
By using a labeled ketone body, D-3-hydroxy[3-14C]butyrate, or a ketone-body precursor, L-[4,53H]leucine, preferential labeling of spinal-cord cholesterol was demonstrated. The phospholipid fraction was more heavily labeled in the liver. In both tissues phosphatidylcholine was the major labeled complex lipid. Incorporation of both substrates into total lipid, on a tissue-weight basis, was appreciably greater for spinal cord.