lmao wrote: > Hi, > > I want to put dihedral constrain on the transmembrane helices of my protein using phi and psi angles to keep it helical during MD run. I wonder how I can do this in Gromacs becasue I could not find it from the manual. I am using Gromacs-3.2.1. Thanks. > Section 4.3.3 in the current manual. Mark