An olfactory receptor database (ORDB) is being developed to facilitate analysis of this large gene family. ORDB currently contains over 400 olfactory receptor sequences and related information, and is available via the World Wide Web. We plan to incorporate functional data, structural models, spatial localization and other categories of information, toward an integrated model of olfactory receptor function. Chem. Senses 22: 321–326, 1997.