4WC1:
reference: Measurement of Acceptor-TPsiC Helix Length of tRNA for Terminal A76-Addition by A-Adding Enzyme., Yamashita S, Martinez A, Tomita K, Structure. 2015 May 5;23(5):830-42. doi: 10.1016/j.str.2015.03.013. Epub 2015 Apr, 23. PMID: 25914059

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