I used the GROMOS96 43a1 force field to simulate my protein with an lipopeptid-inhibitor (topology was done in Prodrg). Ididn't edit any force field parameter. Thanks Stefan -- GMX DSL-Flatrate 0,- Euro* - Überall, wo DSL verfügbar ist! NEU: Jetzt bis zu 16.000 kBit/s! http://www.gmx.net/de/go/dsl