The polymer is synthesized by conjugating multiple HRP enzyme molecules and antibody molecules onto a dextran backbone. This structure enhances the enzyme density on secondary antibodies, establishing a highly sensitive, ready-to-use, non-biotin detection system for IHC staining. The polymer binds to primary antibodies, and horseradish peroxidase (HRP) catalyzes the oxidation of 3,3'-diaminobenzidine (DAB) to form a brown precipitate at antigen sites.