F. H. Wallrapp, J.-J. Pan, G. Ramamoorthy, D. E. Almonacid, B. S. Hillerich, R. Seidel, Y. Patskovsky, P. C. Babbitt, S. C. Almo, M. P. Jacobson and C. D. Poulter. “Prediction of function for the polyprenyl transferase subgroup in the isoprenoid synthase superfamily”.  PNAS, 110 (2013) E1196-E1202.  Open access  PMC3612614