Download

Custom Generated Files

To create a file for download from your selected sequences go back to List and click on the download button in the Options field.

Important Remarks to handle Custom Generated Files

Please make sure that you 'Scan for Unknown Fields' in the Species Information window of ARB when you open a custom-made ARB database for the first time.

To merge your custom-made ARB database with your personal ARB database click on Merge two ARB Databases in the ARB Intro window. Detailed information can be found in the FAQs section.

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

Preconfigured ARB Databases

Download the latest (currently release 100) pre-configured ARB/SILVA databases for the small (16S/18S) and large (23S/28S) subunit ribosomal RNA.

SSU	Ref	241 MB	This is the reference database containing only high quality, aligned 16S/18S ribosomal RNA sequences with a minimum length of 1200 bases for Bacteria and Eukarya and 900 bases for Archaea. A guide tree is included for fast navigation. For details see release information
	Parc	525 MB	This is the comprehensive 16S/18S database with all aligned, quality checked rRNA sequences longer than 300 bases and an alignment or sequence quality value above 30. No tree included, selection of groups can be done based on the EMBL taxonomy.
			An update file is available in the file archive
LSU	Ref	14 MB	This is the reference database containing only high quality, aligned 23S/28S ribosomal RNA sequences with a minimum length of 1900 bases. A guide tree is included for fast navigation.
LSU	Parc	87 MB	This is the comprehensive 23S/28S database with all aligned, quality checked rRNA sequences longer than 300 bases and an alignment or sequence quality value above 30. A guide tree is included for fast navigation.

Fasta exports for SSUParc and LSUParc can be found in the file archive Update files are not longer available see remarks

Unpacking the Files

All files for downloading are compressed by tar and gzip. For unpacking use the tar -xzvf <filename> command under Linux or Opens external link in new window winrar under Windows. If you want to use the SSUParc databases please make sure that you have 4 Gb of main memory and the latest version of ARB installed on your computer.