c search: Users can enter gene or protein identifiers from different organisms to obtain physical and regulatory interaction partners in the human interactome. Results are displayed by the UniHI visualisation tool which offers multiple options to filter interactions (e.g. based on source of interactions or amount of evidence). Drug targets in the retrieved network can be easily highlighted and analysed. Expression data from the UniHI database or uploaded by the user can be employed to derive tissue , process or disease specific networks. Tools for examining the functional relevance of molecular networks are also provided to the user.