2KPV:
reference: NMR structure of the let-7 miRNA interacting with the site LCS1 of lin-41 mRNA from Caenorhabditis elegans., Cevec M, Thibaudeau C, Plavec J, Nucleic Acids Res. 2010 Nov;38(21):7814-21. Epub 2010 Jul 26. PMID: 20660479

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