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Thanks Mark for your reply, <BR>
I wanted to ask you that, the link which I mentioned means opls-aa ff specifially for lipids?<BR>
I wanted to use opls-ff for both protein and lipid , shall I follow the procedure according to the link.<BR>
http://www.gromacs.org/pipermail/gmx-users/2006-September/023639.html<BR>
Thanks for your invaulable suggestion.
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