# Acetylated and amidated terminals in AMBER99SB-ILDN protein, nucleic AMBER94

**URL:** <https://gromacs.bioexcel.eu/t/acetylated-and-amidated-terminals-in-amber99sb-ildn-protein-nucleic-amber94/3286>\
**Category:** User discussions\
**Created:** [December 11, 2021, 6:50am UTC](https://gromacs.bioexcel.eu/t/acetylated-and-amidated-terminals-in-amber99sb-ildn-protein-nucleic-amber94/3286 "2021-12-11T06:50:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mijiddorj](https://avatars.discourse-cdn.com/v4/letter/m/779978/32.png) [@mijiddorj](https://gromacs.bioexcel.eu/u/mijiddorj)\
**Post date:** [December 11, 2021, 6:50am UTC](https://gromacs.bioexcel.eu/t/acetylated-and-amidated-terminals-in-amber99sb-ildn-protein-nucleic-amber94/3286/1 "2021-12-11T06:50:18Z")

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Dear GMX users,

I would like to use acetylated N and amidated C terminals for a peptide in AMBER99SB-ILDN protein, nucleic AMBER94 force field.  
How can I get these terminals from pdb2gmx?

Best regards,  
Mijiddorj