The Protein Structure Initiative is committed to providing quality information and services to the scientific community. In order to do this, we need to know a little about the visitors to our websites. We collect only the domain name and any additional information volunteered by the visitor, such as their e-mail address. We also collect aggregate and user-specific information on what which pages are accessed or visited. The information we collect is used for internal review, to improve the content of our web pages and hardware infrastructure, and to also justify continued support of TargetTrack. We may also notify readers about updates to the website. The database is hosted by the PSI Structural Biology Knowledgebase and collected information is shared with Nature Publishing Group but is not sold or traded with other organizations.