3KYH:
reference: Structure of the Saccharomyces cerevisiae Cet1-Ceg1 mRNA Capping Apparatus., Gu M, Rajashankar KR, Lima CD, Structure. 2010 Feb 10;18(2):216-227. PMID: 20159466

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