The main advantage of using fluorescent labels over enzymatic labels in IHC is the ability to perform multiplexing—detecting multiple antigens simultaneously with different colors. In fluorescent IHC (Immunofluorescence, IF), different primary antibodies (often from different host species) are detected with secondary antibodies conjugated to fluorophores emitting distinct wavelengths (e.g., FITC-green, Texas Red-red, DAPI-blue). Using filters, each antigen can be visualized separately in its own channel and then digitally merged to see co-localization. This is much more challenging with enzymatic IHC because chromogen deposits (like brown DAB and red AEC) physically overlap and can mask each other, and there are fewer distinct, permanent colors available. Fluorescence also offers superior resolution for subcellular localization. The trade-offs are that fluorescent signals can fade (photobleach), require a more expensive fluorescence microscope, and the slides are not permanent in the same way as enzyme-based chromogens mounted with a resin.

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