6HMF:
reference: Structure of the DP1-DP2 PolD complex bound with DNA and its implications for the evolutionary history of DNA and RNA polymerases., Raia P, Carroni M, Henry E, Pehau-Arnaudet G, Brule S, Beguin P, Henneke G, Lindahl E, Delarue M, Sauguet L, PLoS Biol. 2019 Jan 18;17(1):e3000122. doi: 10.1371/journal.pbio.3000122. PMID: 30657780

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