1K4B:
reference: A novel family of RNA tetraloop structure forms the recognition site for Saccharomyces cerevisiae RNase III., Wu H, Yang PK, Butcher SE, Kang S, Chanfreau G, Feigon J, EMBO J 2001 Dec 17;20(24):7240-9. PMID: 11743000

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