1x TDO Assay Buffer is an optimized, proprietary formulation designed for diluting TDO (BPS Cat. #71195) for in vitro enzyme activity assays. This product is intended to be used with the BPS TDO Inhibitor Screening Assay Kit (BPS Cat. #72023) and/or with purified, active TDO, His-tag (BPS Cat. #71195) in combination with TDO Reaction Solution (BPS Cat. #73005).