IDO1 Fluorogenic Reaction Solution is an optimized, proprietary formulation containing all the necessary reaction components for IDO1-catalyzed conversion of L-tryptophan (L-Trp) to kynurenine (Kyn) in in vitro enzyme activity assays. 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).