# Removing suffixes from GTDB taxonomy to improve qiime results

**URL:** https://forum.qiime2.org/t/removing-suffixes-from-gtdb-taxonomy-to-improve-qiime-results/23346
**Category:** General Discussion
**Tags:** taxonomy
**Created:** [June 15, 2022, 5:03am UTC](https://forum.qiime2.org/t/removing-suffixes-from-gtdb-taxonomy-to-improve-qiime-results/23346 "2022-06-15T05:03:19Z")
**Posts on this page:** 1
**Showing post:** 14

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### Author: ![SoilRotifer](https://forum.qiime2.org/user_avatar/forum.qiime2.org/soilrotifer/32/21071_2.png) [@SoilRotifer](https://forum.qiime2.org/u/SoilRotifer)
#### Post date: [June 23, 2022, 4:31pm UTC](https://forum.qiime2.org/t/removing-suffixes-from-gtdb-taxonomy-to-improve-qiime-results/23346/14 "2022-06-23T16:31:19Z")

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> [@biojack](#):
>
> Then I remove suffixed from GTDB and repeated analysis. And at that one, Enteroccocus was found in GTDB as in Silva DB. The problem was in suffixes "Enterococcus", "Enterococcus\_A", "Enterococcus\_B", "Enterococcus\_C", "Enterococcus\_D", "Enterococcus\_E", "Enterococcus\_F", "Enterococcus\_G", "Enterococcus\_I", "Enterococcus\_H". Classifier fail to distinguish them and there was underclassication for Enterococcus genus.
> 
> So if you providing (as I do) analysis within small region (like 16S V4) - removing GTDB suffixes could be way to go.

Thanks for sharing this!

We discuss this similar issue within the [SILVA tutorial](https://forum.qiime2.org/t/processing-filtering-and-evaluating-the-silva-database-and-other-reference-sequence-data-with-rescript/15494) under the "Species-labels: caveat emptor!" section.

-Mike

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