From: Meander Myself (
Date: Thu Oct 16 2014 - 21:01:58 CDT

I have a residue-based CG scheme incorporating a POPE lipid bilayer. The
bilayer normal is in the z-axis direction as usual

What i want to do is select one half of the lipid bilayer (eg cytoplasmic
side). To do this i need to select all lipid molecules with the condition
that one of the headgroup atoms (say the ETA CG bead) is greater than a
certain value (for sake of argument, say >0. )

I then want to save this new selection as another PDB file. How would I do
these 2 steps?