In some advanced two-step polymer systems, the detection reagent is split into two parts: a 'Post Primary' reagent and a Polymer reagent. The 'Post Primary' reagent is not an enzyme but a linking reagent. It typically consists of a polymer backbone conjugated with numerous secondary antibody molecules. Its purpose is to bind to the primary antibody and provide a platform for significant amplification. After this, the 'Polymer' reagent is applied. This reagent contains a different polymer backbone that is conjugated with a large number of enzyme molecules (HRP/AP). This second polymer is designed to bind tightly and specifically to the first polymer (the Post Primary), not directly to tissue. This sequential binding creates an even larger complex with an exceptionally high ratio of enzyme to primary antibody, resulting in extremely high sensitivity for detecting low-abundance antigens while maintaining low background.

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