In essence, Virchow had refined Schwann and Schleiden’s cell theory by adding three more crucial tenets to the two founding ones (“All living organisms are composed of one or more cells,” and “The cell is the basic unit of structure and organization in organisms”): All cells come from other cells (Omnis cellula e cellula). Normal physiology is the function of cellular physiology. Disease, the disruption of physiology, is the result of the disrupted physiology of the cell. These five principles would form the pillars of cell biology and cellular medicine.
