4DKJ:
reference: CpG underrepresentation and the bacterial CpG-specific DNA methyltransferase M.MpeI., Wojciechowski M, Czapinska H, Bochtler M, Proc Natl Acad Sci U S A. 2012 Dec 17. PMID: 23248272

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