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We investigated the synthesis of linked-ring DNAs by two DNA-ligation-based methods. In the first method, two DNA oligonucleotides were associated through a duplex segment of more than a full helical turn. Circularization of the entwined oligonucleotides by T4 DNA ligase resulted in two linked-ring DNAs with a total yield of ∼40%. In the second method, a DNA oligonucleotide was circularized over a...
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