2C7R:
reference: Time-resolved fluorescence of 2-aminopurine as a probe of base flipping in M.HhaI-DNA complexes., Neely RK, Daujotyte D, Grazulis S, Magennis SW, Dryden DT, Klimasauskas S, Jones AC, Nucleic Acids Res. 2005 Dec 9;33(22):6953-60. Print 2005. PMID: 16340006

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).