| 3K7A: reference: Structure of an RNA polymerase II-TFIIB complex and the transcription initiation mechanism., Liu X, Bushnell DA, Wang D, Calero G, Kornberg RD, Science. 2010 Jan 8;327(5962):206-9. Epub 2009 Nov 12. PMID: 19965383 |
This OCA 
Structure page
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(documentation).