You might use freeze groups or position restraints depending what you want.
See manual.

Mark
On Apr 8, 2013 2:58 AM, "Juan Antonio Raygoza Garay" <raygo...@psu.edu>
wrote:

> Hi, is it possible to instruct gromacs to only perform the dynamics on
> half of the system or protein while ignoring the rest?
>
> thanks--
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