The TDO Inhibitor Screening Assay Kit is designed to measure TDO enzyme inhibition. The kit comes in a convenient format, with enough reaction solution and enzyme to perform a total of 100 reactions. The TDO Inhibitor Screening Assay Kit is simple to use. Inhibitor and enzyme are added to a sample containing L-Trp substrate. After a room temperature incubation activity is measured by measuring the absorption of reaction product at λ = 320-325 nm.