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Circular DNA is DNA that forms a closed loop and therefore has no free ends. Examples include:
- Plasmids – mobile genetic elements
- cccDNA – formed by some viruses inside cell nuclei
- Circular bacterial chromosomes
- Mitochondrial DNA (mtDNA)
- Chloroplast DNA (cpDNA) and that of other plastids
- Inverse polymerase chain reaction (Inverse PCR) – technique for finding unknown DNA flanking known DNA
- Effect of circular DNA on gel electrophoresis
- Cyclic nucleotide
- Circular RNA
- Cyclic peptide
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