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<a accesskey="3" href="page.php?w=P1_phage&amp;p=2">3.Next</a>
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<p><b>P1</b> is a <a href="page.php?w=Temperateness_%28virology%29">temperate</a> <a href="page.php?w=bacteriophage">bacteriophage</a> that infects <a href="page.php?w=Escherichia_coli">Escherichia coli</a> and some other bacteria. When undergoing a <a href="page.php?w=lysogenic_cycle">lysogenic cycle</a> the phage genome exists as a <a href="page.php?w=plasmid">plasmid</a> in the bacterium unlike other phages (e.g. the <a href="page.php?w=lambda_phage">lambda phage</a>) that integrate into the host DNA. P1 has an icosahedral head containing the</p><p>
<a accesskey="3" href="page.php?w=P1_phage&amp;p=2">3.Next</a>
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