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)