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OBSOLETE. Intervening protein sequence excised from a protein precursor in protein splicing; inteins catalyze their own excision and many also possess endonuclease activity. [GOC:mah, http://www.neb.com/neb/inteins.html, PMID:8165123]
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The removal of an internal amino acid sequence (an intein) from a protein during protein maturation; the excision of inteins is precise and the N- and C-terminal exteins are joined by a normal peptide bond. Protein splicing involves 4 nucleophilic displacements by the 3 conserved splice junction residues. [GOC:ma, http://www.neb.com/neb/inteins.html]
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