Original: Bushnell , D.A. , Westover , K.D. , Davis , R.E. and Kornberg , R.D. (/O2004/O) Structural basis of transcription : An RNA polymerase II -- TFIIB cocrystal at 4.5 angstroms .
Simplified: Structural basis of transcription : an RNA polymerase II -- TFIIB cocrystal at 4.5 angstroms .