# When performing CREx analysis on mitochondrial genomes, an error always occurs: "Genomes with unequal gene content found." What could be the reasons for this error?

**URL:** <https://help.galaxyproject.org/t/when-performing-crex-analysis-on-mitochondrial-genomes-an-error-always-occurs-genomes-with-unequal-gene-content-found-what-could-be-the-reasons-for-this-error/15433>\
**Category:** Uncategorized\
**Tags:** tool-help, revoluzer\_crex\
**Created:** [May 15, 2025, 9:35am UTC](https://help.galaxyproject.org/t/when-performing-crex-analysis-on-mitochondrial-genomes-an-error-always-occurs-genomes-with-unequal-gene-content-found-what-could-be-the-reasons-for-this-error/15433 "2025-05-15T09:35:16Z")\
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**Author:** ![jennaj](https://sea2.discourse-cdn.com/flex020/user_avatar/help.galaxyproject.org/jennaj/32/27_2.png) [@jennaj](https://help.galaxyproject.org/u/jennaj)\
**Post date:** [May 15, 2025, 6:58pm UTC](https://help.galaxyproject.org/t/when-performing-crex-analysis-on-mitochondrial-genomes-an-error-always-occurs-genomes-with-unequal-gene-content-found-what-could-be-the-reasons-for-this-error/15433/2 "2025-05-15T18:58:39Z")

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Hi @Liulu

For this type of error

> [@Liulu](#):
>
> “Genomes with unequal gene content were found.”

It means that in your “fasta” of species’ genomes, the series of numbers has a different count in one or more.

This file would contain genome fasta strings where the gene count is “equal” for all included. Each has four numbers, each representing a gene.

```auto
> genome1
A B C D
> genome2
A C B D
> genome3
A -C -B D
> genome4
A -C B D

```

And this file wouldn’t be equal – because `genome3` is missing some values. The others have 4 values, and `genome3` only has 2 values. For some reason C and B didn’t get added.

```auto
> genome1
A B C D
> genome2
A C B D
> genome3
A D 
> genome4
A -C B D

```

Sometimes other format problems can also lead to this being detected, including a fasta file that was truncated. You can sometimes spot this by looking at the end of a file with the tool **Select last lines from a dataset**. Other times, just Uploading the file again is enough, maybe the process was interrupted.

Tools that work with fasta files might not work with this particular type of fasa file, but you can still use other **Text Manipulation** tools. Maybe you did some manipulations already? Can you see where the problem was introduced? We have some tutorials that explain how these file parsing tools work, too, maybe it helps?

- [Hands-on: Data Manipulation Olympics / Data Manipulation Olympics / Introduction to Galaxy Analyses](https://training.galaxyproject.org/training-material/topics/introduction/tutorials/data-manipulation-olympics/tutorial.html)

Please give that a try! If you get stuck, you can generate a share link to your history and post it back for feedback. It is hard to guess more without seeing your data. How to:

> [@How to get faster help with your question](https://help.galaxyproject.org/t/how-to-get-faster-help-with-your-question/11469/1):
>
> ## **How to get faster help with your question**
> 
> We love details! 🧑‍🔬 Consider [**Sharing your History**](https://training.galaxyproject.org/training-material/faqs/galaxy/histories_sharing.html) or posting screenshots of your [**Job Information Details**](https://training.galaxyproject.org/training-material/faqs/galaxy/analysis_troubleshooting.html) page.
> 
> Please confirm the [**Server URL**](https://training.galaxyproject.org/training-material/faqs/galaxy/analysis_troubleshooting_reporting.html) (your web browser at the top!) and any [**Tutorial**](https://training.galaxyproject.org/) links involved.

Let’s start there, thanks! 🙂

* * *

XREf → [Search results for 'CREx' - Galaxy Community Help](https://help.galaxyproject.org/search?q=CREx)

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