1J2B:
reference: Alternative tertiary structure of tRNA for recognition by a posttranscriptional modification enzyme., Ishitani R, Nureki O, Nameki N, Okada N, Nishimura S, Yokoyama S, Cell 2003 May 2;113(3):383-94. PMID: 12732145

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