# COM removal

**URL:** <https://gromacs.bioexcel.eu/t/com-removal/9629>\
**Category:** User discussions\
**Created:** [July 12, 2024, 5:37am UTC](https://gromacs.bioexcel.eu/t/com-removal/9629 "2024-07-12T05:37:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SP06](https://avatars.discourse-cdn.com/v4/letter/s/ecb155/32.png) [@SP06](https://gromacs.bioexcel.eu/u/SP06)\
**Post date:** [July 12, 2024, 5:37am UTC](https://gromacs.bioexcel.eu/t/com-removal/9629/1 "2024-07-12T05:37:21Z")

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GROMACS version:  
GROMACS modification: Yes/No  
Here post your question : After building the cyclohexane-water biphasic system, and placing protein (as per biphase tutorial), while going for equilibration, is there any need to add COM motion removal parameters to my .mdp files? If yes, then should it be like the following -  
nstcomm = 1  
comm-mode = Linear  
comm-grps= Protein Non-Protein

Kindly help me with this.