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Enzymes are a vital class of proteins recruited in nearly every cellular process to serve as biological catalysts for their respective biochemical reaction. These biological catalysts contain specialized regions known as active sites. Active sites selectively bind and react with their appropriate substrates to yield detectable byproducts. With the help of sophisticated detection systems, the quantitation of such products can be used to accurately assess enzymatic activity in a cellular pathway of interest. For use in protease, oxidase and various other enzyme assays, our comprehensive selection of enzyme reagents, substrates and kits are well-suited for various biological applications and detection formats.