open-circular DNA (OC-DNA)the non supercoiled conformation adopted by a circular double-stranded DNA MOLECULE, when one or both of the POLYNUCLEOTIDE CHAINS contains a NICK. see SUPERCOILED DNA. Compare COVALENTLY CLOSED CIRCULAR DNA.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005