TOPO cloning is a molecular biology technique in which DNA fragments are cloned into specific vectors without the requirement for DNA ligases. Taq polymerase has a nontemplate-dependent terminal transferase activity that adds a single deoxyadenosine (A) to the 3'-end of the PCR products. This characteristic is exploited in "sticky end" TOPO TA cloning. For "blunt end" TOPO cloning, the recipient vector does not have overhangs and blunt-ended DNA fragments can be cloned.
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