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: Gnatt A.L. Cramer P. Fu J. Bushnell D.A. and Kornberg R.D. 2001.