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UGENE integrates a set of tools for taxonomy classification of microorganisms using whole-genome shotgun sequencing data. The tools are Kraken, CLARK, DIAMOND, etc. See, for example, "Parallel NGS Reads Classification" sample workflow that allows one to classify input FASTQ files with these tools working in parallel and then join their output with another tool WEVOTE.

The tools are available on 64-bit macOS or Linux operating systems only. Also, as the tools are quite resource-consuming, it is recommended to have at least 16 Gb of RAM available.

To use these tools one should provide appropriate taxonomy data and reference data, specific for a tool. Some reference databases are provided for each of the tool. One can use these data or build a custom database (see, for example, workflow element "Build Kraken Database").

It is recommended to use the UGENE Online Installer package to install and automatically configure the data. However, if the Internet is not available on the target computer, or it is required to use another UGENE package for some other reason, follow the instructions below on how to download and configure the data.

Download NGS Classification data

Use links in the "Data for NGS taxonomy classification" section on the "Download UGENE and components" page to download the data.

Make sure to have enough disk space on the target computer.

See the list of the available downloads in the table below.


Archive size

Unpacked data sizeDescriptionData source
NCBI taxonomy classification2.5 Gb31 GbThis includes a set of taxonomy data files from NCBI. These data should be present for any type the NGS classification analysis.Original data were downloaded from the NCBI FTP (
NCBI RefSeq bacterial genomes130 Gb132 Gb

The data can be used to build a database for CLARK-l (light version of CLARK), CLARK, or Kraken.

As UGENE integrates modified version of CLARK/CLARK-l, it is possible to provide *.gz archives as input for building the database. In particular, "CLARK-l DB: RefSeq bacterial+viral genomes" (see below) was generated using the archived data.

Also, keep in mind that changing of some parameters of the "Classify Sequences with CLARK" element may cause re-building of the reference database. The reference data should be present in this case!

For building a Kraken database usage of *.gz archives is not supported, it is required to unpack each *.gz file, so even more disk space will be required.


Original data were downloaded from the NCBI FTP (*.genomic.fna.gz)
NCBI RefSeq viral genomes77 Mb77 Mb

Similarly to "NCBI RefSeq bacterial genomes", although the size of the data is rather small.

The reference data are included into "CLARK-l DB: RefSeq bacterial+viral genomes" and "CLARK-l DB: RefSeq viral genomes" databases.

Original data were downloaded from the NCBI FTP (*.genomic.fna.gz).
NCBI RefSeq GRCh38 human genome837 Mb838 Mb

Similarly to "NCBI RefSeq bacterial genomes".

The data are not included into any database, but provided in case one would like to use them when building a custom database.

Original data were downloaded from the NCBI FTP (*/hs_ref_GRC*chr*.fa.gz).
Kraken DB: MiniKraken 4Gb database2.5 Gb4.3 Gb  
CLARK-l DB: RefSeq bacterial+viral genomes7.4 Gb11 Gb  
CLARK-l DB: RefSeq viral genomes16 Mb72 Mb  
DIAMOND DB: UniRef505.2 Gb13 Gb  
DIAMOND DB: UniRef9013 Gb34 Gb  
Total:161 Gb226 Gb  



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