<FONT size=2> <DIV>thanks for reply.I want to perform simulation of popc membrane.</DIV> <DIV>Steps which i have done are as follows:</DIV> <DIV>1. download popc128a.pdb, popc.it,lipids.itp</DIV> <DIV>(http://moose.bio.ucalgary.ca/index.php?page=Structures_and_Topologies)</DIV> <DIV>2. download ffgmx_lipids files</DIV> <DIV>3.convert POPC of .top & popc.itp into POP as in popc.gro</DIV> <DIV>4. #include "ffgmx.itp" </DIV> <DIV>#include "lipid.itp"</DIV> <DIV>#include "popc.itp"</DIV> <DIV>#include "ffgmxnb.itp"</DIV> <DIV>#include "ffgmxbon.itp"</DIV> <DIV>................ in my .top file.</DIV> <DIV> </DIV> <DIV>Now when I perform</DIV> <DIV>pdb2gmx -ff gmx -f popc128a.pdb -o popc.gro -p popc.top</DIV> <DIV>it shows the error that"Residue 'POP' not found in residue topology database".</DIV> <DIV>I think that's because of the fact that ffgmx.rtp do not </DIV> <DIV>contain "POP" residue ,but it has DPPC residue. </DIV> <DIV>Plz suggest how can i
solve this problem.</DIV> <DIV>thanks.</DIV></FONT><p> 
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