This searchable database contains information about the location, structure, and function of spliceosomal introns in the nuclear genome of Saccharomyces cerevisiae. Searches produce reports for each intron satisfying the search criteria, showing key information, including a short gene description with links to the Saccharomyces Genome Database, estimated transcription rate, special features of the intron, literature or EST verification links, intron size, splice sites and branchpoint sequences and complete sequences of the intron and flanking exons, as well as the sequence generated by splicing. Expression measurements that profile the impact of mutations on the splicing of each intron are also included in the reports. The underlying data can also be downloaded in generic formats. We enjoy hearing suggestions, corrections, and new information and can update the information easily.