Active Motif's Phosphatase Inhibitor Cocktail is designed to protect phosphoproteins from dephosphorylation during lysis and extraction procedures from mammalian cells or tissues and for immunoprecipitation and kinase assays. The cocktail is provided as a ready-to-use broad-spectrum solution of inhibitors targeting both serine/threonine phosphatases and protein tyrosine phosphatases (PTPs). The product is supplied as a 100X concentrated stock solution in a liquid format for improved accuracy, solubility, and ease of use in comparison to traditional tablets.