1. Department of Biochemistry, Allegheny University of the Health Sciences, MCP◆Hahnemann School of Medicine, 2900 Queen Lane, Philadelphia, Pennsylvania 19129, and National Institute for Health and Medical Research (INSERM) Unit 321, “Lipoproteins and Atherogenesis,” Pavillon Benjamin Delessert, Hopital de la Pitie, F-75651 Paris Cedex 13, France