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5.1 Exons are shuffled by<br />
recombin-ation to produce gene<br />
encoding new proteins<br />
• All eukaryotes have introns, and yet<br />
these elements are rare in bacteria. Two<br />
likely explanations for these situation :<br />
1. Introns early model – introns existed in<br />
all organisms but have been lost from<br />
bacteria.<br />
2. Intron late model – introns never existed<br />
in bacteria but rather arose later in<br />
evolution.
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