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The basic unit of life, capable of growing and multiplying. All living things are either single, independent cells or aggregates of cells. A cell is composed of cytoplasm and a nucleus, and is surrounded by a membrane or wall. Cells can be categorized by the presence of specific cell surface markers called clusters of differentiation .

Cell Membrane . A two-layered structure, composed of fatty material, that occurs within and surrounds all cells. Most natural membranes have various proteins, such as receptors and enzymes, embedded in them.

Examples of cells include :



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