Genome of E. coli with ribosomal RNA and tRNA genes highlighted--courtesy

Latest release:

version 4.3.3

(see About rrnDB Versions for changes)


A searchable database documenting variation in ribosomal RNA operons in Bacteria and Archaea.

This release of rrnDB is accompanied by the article:

available as abstract and full text [HTML] [PDF].

Curated by the Schmidt Laboratory at the University of Michigan.

Search the database
Estimate the number of rrn operons
Learn more about rrnDB
Cite the rrnDB's NAR article

The current rrnDB version (4.3.3) includes 2,635 Bacterial records representing 1,383 species, and 175 Archaeal records representing 148 species.