hello Erik I assembled the DPPC bilayer as you did in J. Am. Chem. Soc. 2001, 123, 8638-8639. But I did it only in case with PME (Cut-off gives some kind of micelles). Do you have some idea about it?. So the main question is: what prog did you use for so nice PBC visualization ?(fig. 1). -- Best regards, Andrey mailto:golovin at genebee.msu.su