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Protist Ribosomal Reference database (PR2) - SSU rRNA gene database - old version

online resource
posted on 21.02.2018, 21:10 authored by Daniel VaulotDaniel Vaulot, Laure GuillouLaure Guillou
The Protist Ribosomal Reference database (PR2) provides a unique access to eukaryotic small sub-unit (SSU) ribosomal RNA and DNA sequences, with curated taxonomy. The database mainly consists of nuclear-encoded protistan sequences. However, metazoans, land plants, macrosporic fungi and eukaryotic organelles (mitochondrion, plastid and others) are also included because they are useful for the analysis of high-troughput sequencing data sets. Introns and putative chimeric sequences have been also carefully checked. Taxonomic assignation of sequences consists of eight unique taxonomic fields.

The database is now available on Github for easier maintenance.

Home page :


Daniel VAULOT, Laure GUILLOU and Fabrice NOT
DIPO team, Plankton Group, UMR 7144 CNRS-UPMC
Station Biologique,
Place G. Tessier
29680 Roscoff FRANCE

Please cite

Guillou, L., Bachar, D., Audic, S., Bass, D., Berney, C., Bittner, L., Boutte, C. et al. 2013. The Protist Ribosomal Reference database (PR2): a catalog of unicellular eukaryote Small Sub-Unit rRNA sequences with curated taxonomy. Nucleic Acids Res. 41:D597–604.

The PhytoRef (16S plastid database) is available here :