The Yeast Intron DataBase (YIDB) contains currently available information about all introns encoded in the nuclear and mitochondrial genomes of the yeast Saccharomyces cerevisiae. Introns are divided according to their mechanism of excision: group I and group II introns, pre-mRNA introns, tRNA introns and the HAC1 intron. Information about the host genome, the type of RNA in which they are inserted and their primary structure are provided together with references. For nuclear pre-mRNA introns, transcription frequencies, as determined by microarray experiments, have also been included. This updated database is accessible at: http://www.embl-heidelberg.de/ExternalInfo/seraphin/yidb.htm
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