The IdeS Protease enables fast, easy, and high-performance digestion of immunoglobulin, while the Human and Yeast Protein Extracts provide a test material for optimizing mass spec sample preparation. IdeS Protease is a recombinant, engineered version of the immunoglobulin-degrading enzyme from Streptococcus pyogenes. It is a highly specific protease that slices Immunoglobulin G (IgG) at a single, targeted site, offering 100% digestion in 30 minutes with no optimization. IdeS can be used to characterize therapeutic antibody candidates using LC/MS, and contains a histidine tag for easy removal. The versatile Promega IdeS enzyme cuts IgGs from a range of species, as well as Fc-fusion proteins.