IDO1 Fluorescence Solution is an optimized, proprietary formulation containing necessary reaction components for BPS IDO1 Assay Kits. This product is intended to be used with the BPS Human IDO1 Fluorogenic Inhibitor Screening Assay Kit (BPS Cat. #72037 & Cat. #72047) and/or with purified, active IDO1, His-tag (BPS Cat. #71182) in combination with 1x IDO1 Assay Buffer (BPS Cat. #73002).