rat brain synaptosomes contain enzymes , phosphatidylethanolamine n-methyltransferase ( s ) ( ec 2.1.1.17 ) , that catalyze the methylation of endogenous phosphatidylethanolamine to form its mono- , di- , and trimethyl ( i.e. , phosphatidylcholine ) derivatives .
C0070788
phosphatidylethanolamine
C0025723
methylation