Histofine High StainTM HRP (MULTI) is a detection system to IHC staining providing enhanced staining performance adopted Universal Immuno-enzyme Polymer (UIP) method (US. Patent No. 6,252,053) developed by Nichirei Biosciences Inc. It is applicable to detection of mouse primary antibody and rabbit primary antibody for formalin-fixed paraffin-embedded human tissue sections. It is the labeled polymer prepared by combining amino acid polymers with multiple molecules of peroxidase (HRP) and secondary antibody which is reduced to Fab' fragment. To eliminate background staining, solid-phase adsorption of secondary antibody is carried out with human serum.