Cramer, P. Department of Molecular Biology, MPI for Biophysical Chemistry, Max Planck Society;
http://www.pnas.org/content/100/12/6964.full.pdf (Publisher version)
Armache, K. J., Kettenberger, H., & Cramer, P. (2003). Architecture of initiation-competent 12-subunit RNA polymerase II. Proceedings of the National Academy of Sciences of the USA, 100(12), 6964-6968. doi:10.1073/pnas.1030608100.