CTP is utilized to generate CDP-ethanolamine, and CDP-diacylglycerols which are involved in phospholipid metabolism. other activated intermediates include S-adenosylmethionine (SAM) and 3'-phosphoadenosine 5'-phosphosulfate (PAPs). S-Adeno- sylmethionine is a methyl donor in reactions involving the methylation of the sugar and base moieties of RNA and DNA and in the formation of compounds such as phosphatidylcholine from phosphatidylethanolamine , carnitine from lysine, and so on