The primary role of the chromogen in an enzymatic IHC detection system is to serve as the substrate that is converted by the enzyme label into a visible, colored precipitate. The enzyme (like horseradish peroxidase or alkaline phosphatase) is localized to the antigen site via the antibody-detection complex. When the chromogen solution is applied, along with any necessary co-factors (like hydrogen peroxide for HRP), the enzyme catalyzes a chemical reaction. This reaction transforms the soluble, colorless chromogen molecules into an insoluble, colored compound that precipitates exactly where the enzyme is located. This localized deposition of color marks the site of the target antigen, allowing it to be visualized under a microscope. Different chromogens produce different colors (e.g., DAB gives brown, Fast Red gives red), providing options for contrast or multiplexing.

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Zambia

• ivwananji siwale – 29 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies