Circular DNA is DNA that forms a closed loop and has no 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 Extrachromosomal circular DNA (eccDNA)
See also Circular chromosome Inverse polymerase chain reaction (Inverse PCR), technique for finding unknown DNA flanking known DNA Effect of circular DNA on gel electrophoresis Cyclic nucleotide Cyclic adenosine monophosphate (cAMP) Cyclic guanosine monophosphate (cGMP) Circular RNA Cyclic peptide