The TDO Cellular Activity QuickDetectTM Supplements are designed tocomplement the hTDO-HEK293 Recombinant Cell Line (BPS Cat. #60534) or other TDO-expressingcell lines. This kit contains the cell culture medium supplements necessary foractivation of TDO and for the analysis and detection of tryptophan 2,3 dioxygenase (TDO)-catalyzed conversion of L-tryptophan (L-Trp) to Kynurenine (Kyn). The supplements and thedetection reagents, when used as described, allow for indirect measurement of Kyn levels byanalyzing absorption at 480 nm.