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<p>and <a href="page.php?w=Genetic_recombination">recombination</a> in their <a href="page.php?w=long_terminal_repeat">long terminal repeat</a>s (LTRs). Each HERV family is derived from a single infection of the human <a href="page.php?w=germline">germline</a> by an external <a href="page.php?w=retrovirus">retrovirus</a>. After integrating into the human DNA, these retroviruses expanded and evolved over time. A complete HERV includes a group of specific genes - <a href="page.php?w=Group-specific_antigen">gag</a>, pro, <a href="page.php?w=Pol_%28HIV%29">pol</a></p><p>
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