Dear Mark Thanks for your answer.
I have a pdb file. If I want to cap N- and C-terminal with ACE and NME, respectively, what to do? Is there an specific software for that? Best wishes, Shahab -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.