Inhibition of cardiac phospholipid N-methylation by oxygen free radicals *1M. Kaneko, G. Paolillo, S. Majumder, C. Ou, V. Panagia and N.S. Dhalla. Division of Cardiovascular Sciences, St. Boniface General Hospital Research Centre and Departments of Physiology and Anatomy, University of Manitoba, Winnipeg, Canada R2H 2A6