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any of a group of proteins, containing phosphorus, that occur in the nuclei of living cells

nuclein nu·cle·in (nōō’klē-ĭn, nyōō’-)
Any of the substances present in the nucleus of a cell, consisting chiefly of proteins, phosphoric acids, and nucleic acids.


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  • Nuclei of origin

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  • Nucleo-

    1. a combining form representing nucleus, nuclear, or nucleic acid, in compound words: nucleoprotein. combining form 1. nucleus or nuclear: nucleoplasm 2. nucleic acid: nucleoprotein nucleo- or nucle- pref.

  • Nucleocapsid

    [noo-klee-uh-kap-sid, nyoo-] /ˌnu kli əˈkæp sɪd, ˌnyu-/ noun, Microbiology. 1. the nucleic acid core and surrounding of a virus; the basic viral structure. nucleocapsid nu·cle·o·cap·sid (nōō’klē-ō-kāp’sĭd, nyōō’-) n. The basic structure of a virus, consisting of a core of nucleic acid enclosed in a protein coat.

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