he hPDI (human protein DNA Interactome) database holds experimental protein-DNA interaction data for humans identified by protein microarray assays. The unique characteristics of hPDI are that it contains consensus DNA-binding sequences not only for nearly 500 human TFs but also for more than 500 unconventional DNA-binding proteins, which are completely uncharacterized previously. Users can browse, search, and download a subset or the entire data via a web interface. This database is freely accessible for any academic purposes.