EnVision FLEX DAB+ Substrate Chromogen System (Dako Omnis) is intended for use in immunohistochemistry together with Dako Omnis. The working solution is prepared onboard by the Dako Omnis instrument. It is a high sensitivity DAB system suitable for use in combination with the EnVision FLEX visualization system (Codes GV800/GV823). Upon oxidation, DAB forms a brown end-product at the site of the target antigen. The reagent is intended for use on formalin-fixed, paraffin-embedded tissue sections.