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<br>> I guess your pdb file has been damaged by a text editor (Word?). PDB <br>> files are fixed format, you can not add or remove spaces at will. You <br>> could try clicking together a peptide in Pymol or so, or drop the prodrg <br>> output in Notepad (if you're on Windows). On mac or linux it should be <br>> straightforward with text editors.<br><br><br>I copied the PRODRG PDB into vim, changed HETATM to ATOM and DRG to GLY and renumbered the residues. I really don't understand what I could have done wrong. Can you get the file to convert with pdb2gmx?<br>                                            </body>
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