Role of apolipoprotein E (ApoE) in intracellular lipid metabolism and very low density lipoprotein (VLDL) secretion by mouse hepatocytes . Groningen Institute for Drug Studies, Laboratory of Nutrition & Metabolism, Groningen, *TNO-PG, Gaudius Laboratory, Leiden, **MGC-Department of Human Genetics, University of Leiden, Leiden, the Netherlands