1QTM:
reference: Structure-based design of Taq DNA polymerases with improved properties of dideoxynucleotide incorporation., Li Y, Mitaxov V, Waksman G, Proc Natl Acad Sci U S A 1999 Aug 17;96(17):9491-6. PMID: 10449720

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