SILVA
Welcome to the SILVA rRNA database project
A comprehensive on-line resource for quality checked and aligned ribosomal RNA sequence data.
SILVA provides comprehensive, quality checked and regularly updated datasets of aligned small (16S/18S, SSU) and large subunit (23S/28S, LSU) ribosomal RNA (rRNA) sequences for all three domains of life (Bacteria, Archaea and Eukarya).
SILVA are the official databases of the software package ARB.
For more background information 
Click here
SILVA 126 - web release (Ref datasets and ARB files not updated)
| SSU Parc | LSU Parc | |
|---|---|---|
| Release date | 04.04.2016 | 04.04.2016 |
| Aligned rRNA sequences | 5,366,469 | 645,932 |
SILVAngs
Check out our new service for Next Generation Amplicon data
SILVA Tree Viewer
The SILVA Tree Viewer is a web application to browse and query the SILVA guide trees.
A technical preview is available at 
www.arb-silva.de/treeviewer
ARB
The software package ARB represents a graphically-oriented, fully-integrated package of cooperating software tools for handling and analysis of sequence information.
The ARB project has been started more than 15 years ago by Wolfgang Ludwig at the Technical University in Munich, Germany, see 
www.arb-home.de.
Citations
Quast C, Pruesse E, Yilmaz P, Gerken J, Schweer T, Yarza P, Peplies J, Glöckner FO (2013) The SILVA ribosomal RNA gene database project: improved data processing and web-based tools. Nucl. Acids Res. 41 (D1): D590-D596.
For the taxonomic framework:
Yilmaz P, Parfrey LW, Yarza P, Gerken J, Pruesse E, Quast C, Schweer T, Peplies J, Ludwig W, Glöckner FO (2014) The SILVA and "All-species Living Tree Project (LTP)" taxonomic frameworks. Nucl. Acids Res. 42:D643-D648
SILVA Terms of Use/License Information
SILVA follows a dual licensing model. In short, browsing the content of the SILVA webportal (including results of the data analysis services) and deploying this information is free for all users. Any downloads provided are free for ACADEMIC users. Redistribution of these downloads or their derivates requires a reference to the official SILVA license terms. NON-ACADEMIC users need to acquire a SILVA Commercial License for utilisation of any downloads provided. For the full text and how to acquire a commercial license, please refer to the 
SILVA Terms of Use/License Information
Partners
Please visit our partners. They facilitate the SILVA database project.
SILVA RSS Feed + ARB & SILVA User Group
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News
SILVA training course: From Primer to Paper
From Primer to Paper: Training in Biodiversity Analysis using NGS Amplicon Data - Application now open. Please follow the link for more information on the course content, registration, and payment.
Sneak Preview: SILVA release 128
The first statistics for SILVA release 128. The SILVA 128 release can be expected for October 2016.
SILVA/SILVAngs Job Opening
You are interested to work on an internationally renowned project outside of the classical computer science tasks? We are looking for a Web-developer or Programmer with Ideas, Expertise and Motivation to support the SILVA team.
First version of the SILVA Tree Viewer online
The brand new SILVA Tree Viewer is a web application to browse and query the SILVA guide trees. A technical preview is now available for testing and feedback.
SILVA SSU / LSU 123 - full release
| SSU Parc | SSU Ref | SSU Ref NR | LSU Parc | LSU Ref | |||
|---|---|---|---|---|---|---|---|
| Minimal length | 300 | 1200/900 | 1200/900 | 300 | 1900 | ||
| Quality filtering | basic | strong | strong | basic | strong | ||
| Guide Tree | no | no | yes | no | yes | ||
| Release date | 23.07.15 | 23.07.15 | 23.07.15 | 23.07.15 | 23.07.15 | ||
| Aligned rRNA sequences | 4,985,791 | 1,756,783 | 597,607 | 563,332 | 96,642 |
Differences between releases SSU 123 and 123.1
SILVA SSU 123.1 is an update of the SSU 123 full release providing corrections to the SILVA SSU taxonomy. The sequence data have not been changed. Updated ARB, FASTA, RAST and taxonomy files are provided in the download section. The changes in the taxonomy can be found here.
The LSU 123 datasets have not been updated, therefore, the LSU 123 files are still provided.