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An understanding of cells is therefore vital in any understanding of life itself. Cell biology is the study of cells and how they function, from the subcellular processes which keep them functioning, to the way that cells interact with other cells.
The cell is the lowest level of structure that is capable of performing all the activities of life. 1  For example, the ability of cells to divide is the basis of all reproduction and the basis of growth and repair of multicellular organisms. 2  Understanding how cells work is a major research focus of modern biology.