| 1NDN: reference: Molecular structure of nicked DNA: a substrate for DNA repair enzymes., Aymami J, Coll M, van der Marel GA, van Boom JH, Wang AH, Rich A, Proc Natl Acad Sci U S A 1990 Apr;87(7):2526-30. PMID: 2320572 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).