4QVC:
reference: Structural insights into the recognition of the internal A-rich linker from OxyS sRNA by Escherichia coli Hfq., Wang L, Wang W, Li F, Zhang J, Wu J, Gong Q, Shi Y, Nucleic Acids Res. 2015 Feb 27;43(4):2400-11. doi: 10.1093/nar/gkv072. Epub 2015 , Feb 10. PMID: 25670676

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