PathFinder presents biological signaling and metabolic pathways in an interactive, graphical representation of the cell that can be used to explore the relationships between different pathway components. The online tool provides links to appropriate products from Sigma-Aldrich's product range, including small molecules, antibodies, enzymes, QPCR components and siRNAs for gene knockdown. Additional support is provided through links to detailed product descriptions and technical articles. Sigma-Aldrich800-234-5362www.sigma-aldrich.com