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<p>for repair by the pathways of <a href="page.php?w=homologous_recombination">homologous recombination</a> and <a href="page.php?w=non-homologous_end_joining">non-homologous end joining</a>.</p>

<p><big> Isoforms </big></p>
<p>There are sixteen variants of histone H2B found in humans, thirteen of which are <a href="page.php?w=gene_expression">expressed</a> in regular body cells and three of which are only expressed in the testes. These variants, also called <a href="page.php?w=protein_isoform">isoforms</a>, are proteins that are structurally very similar</p><p>
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