| 3TBL: reference: Structure of monoubiquitinated PCNA: Implications for DNA polymerase switching and Okazaki fragment maturation., Zhang Z, Zhang S, Lin SH, Wang X, Wu L, Lee EY, Lee MY, Cell Cycle. 2012 Jun 1;11(11):2128-36. Epub 2012 Jun 1. PMID: 22592530 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).