Information on gene expression and regulation is expanding rapidly, and the complexity of the experimental design and data makes unique demands on databases to store the results. We describe a prototype database containing experimental results on the expression of mammalian β-like globin genes, along with several query methods for accessing the information. The database has tables for DNA transfer experiments, protein-DNA binding results, and positions of DNase hypersensitive sites, which make extensive use of nested data structures. Comparison of data from various mammals is accomplished by providing a common coordinate system via a simultaneous alignment of matching DNA sequences. Interactive access to the database is available at a site called the Globin Gene Server on the World Wide Web (http://globin.cse.psu.edu). This software should be useful for any genetic system in which DNA sequence data are available.
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