| 1SIG: reference: Crystal structure of a sigma 70 subunit fragment from E. coli RNA polymerase., Malhotra A, Severinova E, Darst SA, Cell 1996 Oct 4;87(1):127-36. PMID: 8858155 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).