This product category contains extracellular proteins of human, murine or rat sequence that, for the most part, initiate or otherwise affect signaling through cell surface receptors. Products listed here include human, murine and rat Interleukins, Colony Stimulating Factors, Growth Factors, Interferons, Adipokines, BMP Proteins, FGFs, TNFs, soluble receptors, extra cellular binding proteins, non-inhibitory Serpins, and other immunoregulatory proteins.