Another research area that we are very interested in concerns protein-protein interactions, and the networks they form. We develop algorithms that help to score and integrate protein interaction data, and make them more easily accessible for researchers to search and browse. We also develop procedures to transfer interaction knowledge between model organisms, and to predict interactions from genomic context. We are particularly interested in comparing interaction networks across species, in order to learn how they evolve and at which organizational level selection is acting. As part of our interest in protein networks, we are participating in the STRING consortium, which maintains one of the most comprehensive public network resources to date (see here).