The RNA modification database

Abstract
The RNA modification database provides a comprehensive listing of posttranscriptionally modified nucleosides from all RNAs, and is maintained as an updated version of the initial printed report [Limbach, P.A., Crain,P.F. and McCloskey,J.A. (1994) Nucleic Acids Res., 22, 2183–2196]. Information provided for each nucleoside includes: the RNA in which it occurs and phylogenetic distribution; common chemical name and symbol; Chemical Abstracts registry number and index name; chemical structure; initial literature citations for structural characterization or occurrence, and for chemical synthesis. The data are available through the WWW and via anonymous ftp.