SILVA Databases for ARB

SILVA Release 119: Download the latest SILVA databases for ARB for small (16S/18S) and large (23S/28S) subunit ribosomal RNAs.

SSU

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238 MB 

This SSU dataset is now the recommended reference database. It is based on the Ref 119 dataset with a 99% criterion applied to remove redundant sequences using the UCLUST tool. Sequences from cultivated species have been preserved independent from prior filtering. The final dataset contains 534,968 sequences and can be used as a representative dataset for phylogenetic analysis and classification. A fully classified, manually curated tree is included for fast navigation. Opens internal link in current windowMore information on Ref NR ...

Initiates file downloadRef

445 MB This SSU dataset containing all high quality, aligned 16S/18S ribosomal RNA sequences with a minimum length of 1200 bases for Bacteria and Eukarya and 900 bases for Archaea. For details see Opens internal link in current windowrelease information

LSU

Initiates file downloadRef102  MB

This is the LSU reference database containing only high quality, aligned 23S/28S ribosomal RNA sequences with a minimum length of 1900 bases. A fully classified guide tree is included for fast navigation. For details see Opens internal link in current windowrelease information

Initiates file downloadParc 181  MB

This is the comprehensive 23S/28S database with all aligned, quality checked rRNA sequences longer than 300 bases.

All ARB files as well as FASTA exports can be found in the Opens external link in new windowFile Archive

All files can also be accessed via our FTP-server ftp.arb-silva.de

Unpacking the Files

All files for downloading are compressed by tar and/or gzip. For unpacking use the tar -xzvf <filename> or gunzip <filname> command under Linux or Opens external link in new window winrar under Windows. Please also check if you have sufficient main memory (RAM) available to handle the databases (see box below) and make sure that you have the latest version of ARB installed on your computer.

ARB/SILVA Hardware Requirements

ARB is a so-called "in-memory" database and the larger the databases are, the more main memory (RAM) is required by ARB to handle them. This is by far the most important aspect you have to consider when asking for ARB hardware requirements!

The following table will help you to find out more about the ARB hardware requirements for the SILVA rRNA databases listed above:

ARB/SILVA Memory Requirements v1.3 (pdf, 34 kb).

Copyright/License Information

Users from non-academic/commercial environments should have a look at the SILVA Terms of Use/License Information