4LCK:
reference: Co-crystal structure of a T-box riboswitch stem I domain in complex with its cognate tRNA., Zhang J, Ferre-D'Amare AR, Nature. 2013 Aug 15;500(7462):363-6. doi: 10.1038/nature12440. Epub 2013 Jul 28. PMID: 23892783

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