1Y7Y:
reference: High-resolution crystal structure of the restriction-modification controller protein C.AhdI from Aeromonas hydrophila., McGeehan JE, Streeter SD, Papapanagiotou I, Fox GC, Kneale GG, J Mol Biol. 2005 Feb 25;346(3):689-701. Epub 2005 Jan 12. PMID: 15713456

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