In the body, biochemical and environmental signals control intracellular processes as well as interactions between cells, tissues, and organs. As a result, inhibitors are critical tools for researchers who work on cell signaling or who are trying to gain a better understanding of the intracellular mechanisms that control cell fate, function, and phenotype. From libraries and pathway panels to individual inhibitors, we offer the widest and most cited selection of Calbiochem® inhibitors and activators worldwide.