# DNA ending effect

**URL:** <https://gromacs.bioexcel.eu/t/dna-ending-effect/3812>\
**Category:** User discussions\
**Created:** [March 9, 2022, 3:54pm UTC](https://gromacs.bioexcel.eu/t/dna-ending-effect/3812 "2022-03-09T15:54:29Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![kandresen](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/kandresen/32/747_2.png) [@kandresen](https://gromacs.bioexcel.eu/u/kandresen)\
**Post date:** [March 15, 2022, 9:25pm UTC](https://gromacs.bioexcel.eu/t/dna-ending-effect/3812/13 "2022-03-15T21:25:09Z")

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Amnah,

I had this same issue. I went into it in the post that genie alluded to. Genie gave a great example of how to do the “pull” function and I tried my best to go into detail with how to do the approach that Justin suggests. In case you missed the link above:  
[https://gromacs.bioexcel.eu/t/constraining-terminal-basepairs-in-dna/2549](https://gromacs.bioexcel.eu/t/constraining-terminal-basepairs-in-dna/2549)

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