Dears, I got a link sent me by Peter Lai to simulate POPC in water: http://uab.hyperfine.info/~pcl/files/popc36/ He used TIP3SP, as it is apparent in its top file. I want to use simulate my own system of POPC in water with tip3p model of water? Is it possible to use its Peter's top and itp files? Please help me Sincerely, Shima