4ZCF:
reference: Structural basis of asymmetric DNA methylation and ATP-triggered long-range diffusion by EcoP15I., Gupta YK, Chan SH, Xu SY, Aggarwal AK, Nat Commun. 2015 Jun 12;6:7363. doi: 10.1038/ncomms8363. PMID: 26067164

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