Corrections to J. Chem. Theory Comput. 4, 468-476 (2008)

• Section 1. Ellipsoids have been used also for the mesoscopic modelling of proteins. Reference: Liwo, A.; Khalili, M.; Czaplewski, C.; Kalinowski, S.; Oldziej, S.; Wachucik, K.; Scheraga H. A. Modification and optimization of the united-residue (UNRES) potential energy function for canonical simulations. I. Temperature dependence of the effective energy function and tests of the optimization method with single training proteins. J. Phys. Chem. B 2007, 111, 260.

• Section 4.1. Chimera's render engine is based on OpenGL, not on VRML. VRML is just an export option. Chimera does have performance issues and Ref. 4 discusses them, attributing the reason to the extensive use of script language.