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<p><a href="page.php?w=in_vitro">in vitro</a> and there are four <a href="page.php?w=Nuclear_localization_sequence">nuclear localization signals</a> and sites for <a href="page.php?w=Protein-protein_interaction">interaction with other cellular proteins</a> within the N-terminal domain.  The N-terminal domain is followed by a highly conserved, 421 amino acid core domain containing all of the catalytic residues except the active site <a href="page.php?w=tyrosine">tyrosine</a>.  This is followed by a poorly conserved linker domain of 77 amino acids.</p><p>
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