Abbreviations: BDGP, Berkeley Drosophila Genome Project; BIND,Biomolecular Interaction Network Database; BioGRID, General Repository for Interaction Datasets; CYGD, Comprehensive Yeast Genome Database; DIP, Database of Interacting Proteins; GEO, Gene Expression Omnibus; GO, Gene Ontology; MGI,Mouse Genome Informatics [which provides integrated access to several projects, including the Mouse Phenome Database (MPD) and the Mouse Gene Expression Database (GXD)]; MINT, a Molecular Interaction Database; OMIM,Online Mendelian Inheritance in Man; SGD, Saccharomyces Genome Database; TAIR, The Arabidopsis Information Resource; ZFIN, Zebrafish Information Network.