# FAQ: Comparative Genomics

## What does the `tail <1% each taxon` mean in the Kaiju output?

This option allows users to exclude rare lineages which would congest the plot. However, underlying analysis is not affected and the data can be replotted.

## Can I use the GTDB database within Kaiju?

Yes, you can run the our GTDB-tk Classify app on the same data as you run through Kaiju and compare. The GTDB-tk app is in the Microbial Communities section of the Apps Panel in the Narrative interface. One distinction: Kaiju runs on raw sequencing data (reads) and GTDB-tk works on assembled contigs.

## Does the Kaiju analysis give a text output that can be used in R, for example?

Yes, at the bottom of the App cell you can see an option to download kaiju\_classification.zip and kaiju\_summaries.zip which both contain text files.