the only known mammalian pathway for the synthesis de novo of choline molecules is catalysed by phosphatidylethanolamine n-methyltransferase ( pemt ) , which synthesizes phosphatidylcholine ( ptdcho ) via sequential methylation of phosphatidylethanolamine ( ptdetn ) using s-adenosylmethionine ( adomet ) as a methyl donor .
C0070788
phosphatidylethanolamine n-methyltransferase
C0025723
methylation