Schenkel Laila Cigana LC Department of Human Health and Nutritional Sciences, University of Guelph, Animal Science and Nutritional Bldg., Rm. 309, Guelph, ON, N1G 2W1, Canada, - - 2014 Choline is an essential nutrient required for the biosynthesis of membrane lipid phosphatidylcholine (PtdCho).