[gmx-users] Center of mass: distance restrain for groups

[Li, Hualin]

Dear GMX users, 

   How are you doing? I have a question about using distance restrain in GROMACS, have you ever use the distance restrain to between the protein and the center of mass of membrane. In gromacs, I can not find the option to choose the center of mass of specific groups like membrane.
    Any ideas please? Thank you very much for your help.

Best,
Hualin