2XDB:
reference: A processed noncoding RNA regulates an altruistic bacterial antiviral system., Blower TR, Pei XY, Short FL, Fineran PC, Humphreys DP, Luisi BF, Salmond GP, Nat Struct Mol Biol. 2011 Feb;18(2):185-90. Epub 2011 Jan 16. PMID: 21240270

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