4ED7:
reference: Watching DNA polymerase eta make a phosphodiester bond., Nakamura T, Zhao Y, Yamagata Y, Hua YJ, Yang W, Nature. 2012 Jul 11;487(7406):196-201. doi: 10.1038/nature11181. PMID: 22785315

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