Original: Gnatt , A.L. , Cramer , P. , Fu , J. , Bushnell , D.A. and Kornberg , R.D. (/O2001/O) Structural basis of transcription : An RNA polymerase II elongation complex at 3.3 Å resolution .
Simplified: Structural basis of transcription : an RNA polymerase II elongation complex at 3.3 Å resolution .