5WTX:
reference: Nop9 binds the central pseudoknot region of 18S rRNA., Wang B, Ye K, Nucleic Acids Res. 2017 Jan 3. pii: gkw1323. doi: 10.1093/nar/gkw1323. PMID: 28053123

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