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The study of cells and their physiological properties, structure, environmental interaction, division, life cycle, and death, as well as the organelles they contain. Also known as cytology.

The cell is the basic functional unit of all known life forms, and it is the smallest unit which can replicate independently. Cells are bound in membranes and filled with cytoplasm. They contain a variety of molecules, structures, and organelles, and they perform a variety of functions. Cell biology is a broad field so relevant complementary tags should also be considered.