Integrating all known human, mouse, and rat genes and proteins into one database, the iGene search engine helps scientists filter through more than 250,000 products related to their gene or protein of interest. Researchers can search using several criteria, including keyword, gene accession number, gene symbol, or batch search to find all of the antibody, assay, protein, cloning, qPCR, or RNAi products available. Search results also link to external resources at the National Center for Biotechnology Information (NCBI) and to relevant signaling and metabolic pathway maps on the iPath Online Bioatlas.