3BT7:
reference: Structure of a TrmA-RNA complex: A consensus RNA fold contributes to substrate selectivity and catalysis in m5U methyltransferases., Alian A, Lee TT, Griner SL, Stroud RM, Finer-Moore J, Proc Natl Acad Sci U S A. 2008 May 13;105(19):6876-81. Epub 2008 May 1. PMID: 18451029

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