Hi, Mark, thanks for your reply. After some efforts I have been successful to insert potassium using ff oplsaa. But it seems that ff g43a1 actually can not recognize K or K+. It doesnt matter, anyway I can select ff oplsaa. Zhongqiao Hu Lab E5-04-27 Tel: 65161946(O) Department of Chemical and Biomolecular Engineering National University of Singapore 117576, Singapore
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