<HTML><BODY>Hy. I want to ask your help. I work with protein, which contain copper, for thermostability research. But gromacs, when I use for example CHARMM27 force field, is not correct work with copper ions. May be someone know some libraries or parametrisation files, which can help me work with my protein? <br> <br><br><br>С уважением,<br>Коляденко Илья<br>kolyadenko_ilya@mail.ru</BODY></HTML>