3TRZ:
reference: Molecular Basis for Interaction of let-7 MicroRNAs with Lin28., Nam Y, Chen C, Gregory RI, Chou JJ, Sliz P, Cell. 2011 Nov 23;147(5):1080-91. Epub 2011 Nov 10. PMID: 22078496

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