1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + S-adenosyl-L-methionine = 1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phospho-N-methylethanolamine + S-adenosyl-L-homocysteine + H(+)
1,2-di-(9z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + s-adenosyl-l-methionine = 1,2-di-(9z-octadecenoyl)-sn-glycero-3-phospho-n-methylethanolamine + s-adenosyl-l-homocysteine + h(+)