2YLB:
reference: Structural basis for RNA 3'-end recognition by Hfq., Sauer E, Weichenrieder O, Proc Natl Acad Sci U S A. 2011 Aug 9;108(32):13065-70. Epub 2011 Jul 7. PMID: 21737752

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