Circular DNA

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)