# 03ws with OL3 RNA

**URL:** <https://gromacs.bioexcel.eu/t/03ws-with-ol3-rna/9832>\
**Category:** User discussions\
**Tags:** forcefield\
**Created:** [August 7, 2024, 4:31am UTC](https://gromacs.bioexcel.eu/t/03ws-with-ol3-rna/9832 "2024-08-07T04:31:23Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![slweng0321](https://avatars.discourse-cdn.com/v4/letter/s/ad7895/32.png) [@slweng0321](https://gromacs.bioexcel.eu/u/slweng0321)\
**Post date:** [August 7, 2024, 4:31am UTC](https://gromacs.bioexcel.eu/t/03ws-with-ol3-rna/9832/1 "2024-08-07T04:31:23Z")

</div>

GROMACS version: 2024.1  
GROMACS modification: No  
Dear all,  
I am wondering if there is a way to use ff03ws for protein and OL3 for RNA?  
I want to compare the behavior and structure of my protein with and without RNA, and my protein-only simulations have done with ff03ws. As I know, the RNA force field bundled with ff03ws is not reliable. Thanks in advanced.

---

<div class="post-metadata">

**Author:** ![Karis](https://avatars.discourse-cdn.com/v4/letter/k/ed8c4c/32.png) [@Karis](https://gromacs.bioexcel.eu/u/Karis)\
**Post date:** [August 16, 2024, 7:40am UTC](https://gromacs.bioexcel.eu/t/03ws-with-ol3-rna/9832/2 "2024-08-16T07:40:16Z")

</div>

You can use [gromologist](https://gitlab.com/KomBioMol/gromologist) to explicitly list parameters from different forcefields in your simulation (refer to this [post](https://gromacs.bioexcel.eu/t/dna-rna-simulations/8055/2) for more details)