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Cholesterol a lipid molecule and is biosynthesized by all animal cells because it is an essential structural component of all animal (not plant or bacterial) cell membranes that is required to maintain both membrane structural integrity and fluidity. Cholesterol enables animal cells to (a) not need a cell wall (like plants & bacteria) to protect membrane integrity/cell-viability and thus be able to (b) change shape and (c) move about (unlike bacteria and plant cells which are restricted by their cell walls).
Related Journals of Cholesterol
Journal of Cholesterol, Journal of the American College of Cardiology, Nutrition Journal, The American Journal of Clinical Nutrition, American Heart Association and An International Journal of Medicine