4PLX:
reference: Structural insights into the stabilization of MALAT1 noncoding RNA by a bipartite triple helix., Brown JA, Bulkley D, Wang J, Valenstein ML, Yario TA, Steitz TA, Steitz JA, Nat Struct Mol Biol. 2014 Jul;21(7):633-40. doi: 10.1038/nsmb.2844. Epub 2014 Jun, 22. PMID: 24952594

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