The Arabidopsis Information Resource (TAIR) provides a comprehensive resource for the scientific community working with Arabidopsis thaliana, a widely used model plant. TAIR consists of a searchable relational database, which includes many different datatypes. Data can be viewed using a interactive MapViewer, and analyzed with our tools. Datasets can be downloaded. In addition, pages on news, information on the Arabidopsis Genome Initiative (AGI), Arabidopsis lab protocols, and useful links are provided.