# Membrane protein simulation

**URL:** <https://gromacs.bioexcel.eu/t/membrane-protein-simulation/12247>\
**Category:** User discussions\
**Tags:** mdrun\
**Created:** [June 17, 2025, 3:18pm UTC](https://gromacs.bioexcel.eu/t/membrane-protein-simulation/12247 "2025-06-17T15:18:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nikhila](https://avatars.discourse-cdn.com/v4/letter/n/2bfe46/32.png) [@nikhila](https://gromacs.bioexcel.eu/u/nikhila)\
**Post date:** [June 17, 2025, 3:18pm UTC](https://gromacs.bioexcel.eu/t/membrane-protein-simulation/12247/1 "2025-06-17T15:18:10Z")

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GROMACS version:2025  
GROMACS modification: No  
How to extract data at 100ns when the simulation is running for 550ns?

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**Author:** ![lmullender](https://avatars.discourse-cdn.com/v4/letter/l/8dc957/32.png) [@lmullender](https://gromacs.bioexcel.eu/u/lmullender)\
**Post date:** [June 18, 2025, 2:23pm UTC](https://gromacs.bioexcel.eu/t/membrane-protein-simulation/12247/2 "2025-06-18T14:23:42Z")

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Hi!  
You can take a look at `gmx trjconv`:

> **[gmx trjconv - GROMACS 2025.2 documentation](https://manual.gromacs.org/current/onlinehelp/gmx-trjconv.html)**

The `-b`, `-e` and `-skip` options should be helpful. That’s assuming you are saving configurations to the trajectory file at an appropriate frequency during the simulation.