4DQI:
reference: Structural factors that determine selectivity of a high-fidelity DNA polymerase for deoxy-, dideoxy-, and ribo-nucleotides., Wang W, Wu EY, Hellinga HW, Beese LS, J Biol Chem. 2012 May 30. PMID: 22648417

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