# Gmx genion -s proteinions.tpr -o proteinions.gro -p protein.top -pname NA -nname CL -neutral

**URL:** <https://gromacs.bioexcel.eu/t/gmx-genion-s-proteinions-tpr-o-proteinions-gro-p-protein-top-pname-na-nname-cl-neutral/4466>\
**Category:** User discussions\
**Tags:** grompp\
**Created:** [July 15, 2022, 6:55am UTC](https://gromacs.bioexcel.eu/t/gmx-genion-s-proteinions-tpr-o-proteinions-gro-p-protein-top-pname-na-nname-cl-neutral/4466 "2022-07-15T06:55:12Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Snigdha](https://avatars.discourse-cdn.com/v4/letter/s/c6cbf5/32.png) [@Snigdha](https://gromacs.bioexcel.eu/u/Snigdha)\
**Post date:** [July 18, 2022, 11:45am UTC](https://gromacs.bioexcel.eu/t/gmx-genion-s-proteinions-tpr-o-proteinions-gro-p-protein-top-pname-na-nname-cl-neutral/4466/3 "2022-07-18T11:45:30Z")

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Thanks a lot for the guidance, I added CL to ions.itp file inside charmm and got the results…:)

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