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Nucleus is a term used in various fields of science to refer to a central or core structure. It is derived from the Latin word "nucleus," meaning "kernel" or "core."In biology, the nucleus refers to the membrane-bound organelle found in eukaryotic cells that contains the genetic material (DNA) of the cell. It acts as the control center of the cell, regulating gene expression and coordinating cellular activities.In chemistry, nucleus refers to the positively charged central core of an atom that contains protons and neutrons. The number of protons in an atom's nucleus determines its atomic number and chemical properties.In physics, nucleus refers to a collection of protons and neutrons bound together by strong nuclear forces. Nuclei are found within atoms and are responsible for their stability and mass.The term nucleus can also be used more broadly to describe a central or essential part of something. For example, in social sciences, the concept of social nucleus refers to a small group of individuals who form the core of a larger social network.Overall, whether referring to cells, atoms, or social structures, the concept of nucleus represents a central or core component that plays a crucial role in various systems.

The nucleus's main products are proteins and DNA.