Minimum Bases for Circularizing DNA: How Small?

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What is the minimum no. of bases needed for circularising DNA ?
or
What is the length of the smallest circular DNA ?
 
Biology news on Phys.org
Some of the smallest circular plasmid are between 500 to 750 bp.
 
44 mer is possible http://nar.oupjournals.org/cgi/content/full/27/2/624
 
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