The PDE10A1 Assay Kit is designed for identification of PDE10A1 inhibitors using fluorescence polarization. The assay is based on the binding of a fluorescent nucleotide monophosphate generated by PDE10A1 to the binding agent. The key to the PDE10A1 Assay Kit is the specific binding agent. Using this kit, only two simple steps on a microtiter plate are required for PDE10A1 reactions. First, the fluorescently labeled cAMP is incubated with a sample containing PDE10A1 for 1 hour. Second, a binding agent is added to the reaction mix to produce a change in fluorescent polarization. The FP signal is measured using a fluorescent microplate reader capable of measuring fluorescence polarization.