4NBI:
reference: Mechanism of chiral proofreading during translation of the genetic code., Ahmad S, Routh SB, Kamarthapu V, Chalissery J, Muthukumar S, Hussain T, Kruparani SP, Deshmukh MV, Sankaranarayanan R, Elife. 2013 Dec 3;2(0):e01519. doi: 10.7554/eLife.01519. PMID: 24302572

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