. "\"Catalysis of the reaction: S-adenosyl-L-methionine + phospholipid olefinic fatty acid = S-adenosyl-L-homocysteine + phospholipid methylene fatty acid.\" [EC:2.1.1.16]" . . "methylene-fatty-acyl-phospholipid synthase activity" . "S-adenosyl-L-methionine:unsaturated-phospholipid methyltransferase (methenylating)" . "EC:2.1.1.16" . "MetaCyc:2.1.1.16-RXN" . . "cyclopropane synthetase activity" . "unsaturated-phospholipid methyltransferase activity" .