EnVision FLEX+, Mouse, High pH is a very-high-sensitivity visualization system intended for use in immunohistochemistry together with Autostainer Link Instruments. The EnVision FLEX+ Mouse (LINKER) amplifies the signal of primary mouse antibodies and the reaction is visualized by DAB+ Chromogen. In addition to the EnVision FLEX+ Mouse (LINKER) the convenience kit includes Peroxidase-Blocking Reagent, EnVision/HRP, DAB+ Chromogen, Substrate Buffer, Target Retrieval Solution, High pH (50x Tris/EDTA buffer, pH 9), and Wash Buffer (20x). The EnVision FLEX+ Rabbit (LINKER), Code K8009, is an optional EnVision FLEX reagent that may be used with EnVision FLEX and FLEX+ convenience kits to amplify the signal of primary rabbit antibodies. EnVision FLEX+ convenience kits are compatible with all optional EnVision FLEX and FLEX+ reagents for Autostainer Link Instruments.